diff --git a/src/com/bytezone/diskbrowser/cpm/CPMDisk.java b/src/com/bytezone/diskbrowser/cpm/CPMDisk.java
index 05b21c1..5c4dadd 100644
--- a/src/com/bytezone/diskbrowser/cpm/CPMDisk.java
+++ b/src/com/bytezone/diskbrowser/cpm/CPMDisk.java
@@ -55,7 +55,7 @@ public class CPMDisk extends AbstractFormattedDisk
     // search for the version string
     for (int i = 8; i >= 4; i -= 2)
     {
-      byte[] buffer = disk.readSector (0, i);
+      byte[] buffer = disk.readBlock (0, i);
       String text = new String (buffer, 16, 24);
       if ("DIR ERA TYPESAVEREN USER".equals (text))
       {
@@ -72,8 +72,8 @@ public class CPMDisk extends AbstractFormattedDisk
     {
       DiskAddress da = disk.getDiskAddress (3, sector);
 
-      sectorTypes[da.getBlock ()] = catalogSector;
-      byte[] buffer = disk.readSector (da);
+      sectorTypes[da.getBlockNo ()] = catalogSector;
+      byte[] buffer = disk.readBlock (da);
       int b1 = buffer[0] & 0xFF;
       int b2 = buffer[1] & 0xFF;
       if (b1 == 0xE5)
@@ -95,8 +95,8 @@ public class CPMDisk extends AbstractFormattedDisk
         DirectoryEntry entry = new DirectoryEntry (this, buffer, i);
         SectorType sectorType = getSectorType (entry.getType ());
         for (DiskAddress block : entry.getSectors ())
-          if (!disk.isSectorEmpty (block))
-            sectorTypes[block.getBlock ()] = sectorType;
+          if (!disk.isBlockEmpty (block))
+            sectorTypes[block.getBlockNo ()] = sectorType;
 
         DirectoryEntry parent = findParent (entry);
         if (parent == null)
@@ -166,8 +166,8 @@ public class CPMDisk extends AbstractFormattedDisk
   public DataSource getFormattedSector (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
-    SectorType type = sectorTypes[da.getBlock ()];
-    byte[] buffer = disk.readSector (da);
+    SectorType type = sectorTypes[da.getBlockNo ()];
+    byte[] buffer = disk.readBlock (da);
 
     if (type == catalogSector)
       return new CPMCatalogSector (disk, buffer, da);
@@ -209,7 +209,7 @@ public class CPMDisk extends AbstractFormattedDisk
 
     for (int i = 8; i >= 4; i -= 2)
     {
-      byte[] buffer = disk.readSector (0, i);
+      byte[] buffer = disk.readBlock (0, i);
       String text = new String (buffer, 16, 24);
       if ("DIR ERA TYPESAVEREN USER".equals (text))
       {
@@ -221,7 +221,7 @@ public class CPMDisk extends AbstractFormattedDisk
 
     for (int sector = 0; sector < 8; sector++)
     {
-      byte[] buffer = disk.readSector (3, sector);
+      byte[] buffer = disk.readBlock (3, sector);
 
       // check if entire sector is empty (everything == 0xE5)
       if (bufferContainsAll (buffer, (byte) 0xE5))
diff --git a/src/com/bytezone/diskbrowser/cpm/DirectoryEntry.java b/src/com/bytezone/diskbrowser/cpm/DirectoryEntry.java
index 68a56e2..6c3eb2e 100644
--- a/src/com/bytezone/diskbrowser/cpm/DirectoryEntry.java
+++ b/src/com/bytezone/diskbrowser/cpm/DirectoryEntry.java
@@ -188,7 +188,7 @@ class DirectoryEntry implements AppleFileSource
     if (appleFile != null)
       return appleFile;
 
-    byte[] buffer = disk.readSectors (blocks);
+    byte[] buffer = disk.readBlocks (blocks);
 
     if (buffer.length == 0)
     {
diff --git a/src/com/bytezone/diskbrowser/disk/AbstractFormattedDisk.java b/src/com/bytezone/diskbrowser/disk/AbstractFormattedDisk.java
index c1c6426..838f740 100755
--- a/src/com/bytezone/diskbrowser/disk/AbstractFormattedDisk.java
+++ b/src/com/bytezone/diskbrowser/disk/AbstractFormattedDisk.java
@@ -113,7 +113,7 @@ public abstract class AbstractFormattedDisk implements FormattedDisk
     sectorTypes = new SectorType[disk.getTotalBlocks ()];
 
     for (DiskAddress da : disk)
-      sectorTypes[da.getBlock ()] = disk.isSectorEmpty (da) ? emptySector : usedSector;
+      sectorTypes[da.getBlockNo ()] = disk.isBlockEmpty (da) ? emptySector : usedSector;
 
     setGridLayout ();
   }
@@ -147,8 +147,8 @@ public abstract class AbstractFormattedDisk implements FormattedDisk
         break;
 
       case 1600:
-        if (disk.getSectorsPerTrack () == 32)
-          gridLayout = new Dimension (disk.getSectorsPerTrack (), disk.getTotalTracks ());
+        if (disk.getBlocksPerTrack () == 32)
+          gridLayout = new Dimension (disk.getBlocksPerTrack (), disk.getTotalTracks ());
         else
           gridLayout = new Dimension (16, 100);
         break;
@@ -366,7 +366,7 @@ public abstract class AbstractFormattedDisk implements FormattedDisk
   public SectorType getSectorType (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
-    return sectorTypes[da.getBlock ()];
+    return sectorTypes[da.getBlockNo ()];
   }
 
   // ---------------------------------------------------------------------------------//
@@ -394,12 +394,14 @@ public abstract class AbstractFormattedDisk implements FormattedDisk
   public DataSource getFormattedSector (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
-    if (da.getBlock () == 0 && bootSector != null)
+    if (da.getBlockNo () == 0 && bootSector != null)
       return bootSector;
 
-    SectorType sectorType = sectorTypes[da.getBlock ()];
-    byte[] buffer = disk.readSector (da);
-    String address = String.format ("%02X %02X", da.getTrack (), da.getSector ());
+    SectorType sectorType = sectorTypes[da.getBlockNo ()];
+    byte[] buffer = disk.readBlock (da);
+
+    //    String address = String.format ("%02X %02X", da.getTrackNo (), da.getSectorNo ());
+    String address = String.format ("%02X", da.getBlockNo ());
 
     if (sectorType == emptySector)
       return new DefaultSector ("Empty sector at " + address, disk, buffer, da);
@@ -409,6 +411,7 @@ public abstract class AbstractFormattedDisk implements FormattedDisk
     String name = getSectorFilename (da);
     if (!name.isEmpty ())
       name = " : " + name;
+
     return new DefaultSector ("Data sector at " + address + name, disk, buffer, da);
   }
 
@@ -449,7 +452,7 @@ public abstract class AbstractFormattedDisk implements FormattedDisk
   public boolean isSectorFree (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
-    return freeBlocks.get (da.getBlock ());
+    return freeBlocks.get (da.getBlockNo ());
   }
 
   // ---------------------------------------------------------------------------------//
@@ -482,7 +485,7 @@ public abstract class AbstractFormattedDisk implements FormattedDisk
   public boolean stillAvailable (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
-    return stillAvailable (da.getBlock ());
+    return stillAvailable (da.getBlockNo ());
   }
 
   // ---------------------------------------------------------------------------------//
diff --git a/src/com/bytezone/diskbrowser/disk/AppleDisk.java b/src/com/bytezone/diskbrowser/disk/AppleDisk.java
index 8e6150f..9604e30 100755
--- a/src/com/bytezone/diskbrowser/disk/AppleDisk.java
+++ b/src/com/bytezone/diskbrowser/disk/AppleDisk.java
@@ -339,12 +339,12 @@ public class AppleDisk implements Disk
 
     for (DiskAddress da : this)         // uses blockList.iterator
     {
-      byte[] buffer = readSector (da);
-      hasData[da.getBlock ()] = false;
+      byte[] buffer = readBlock (da);
+      hasData[da.getBlockNo ()] = false;
       for (int i = 0; i < sectorSize; i++)
         if (buffer[i] != emptyByte)
         {
-          hasData[da.getBlock ()] = true;
+          hasData[da.getBlockNo ()] = true;
           break;
         }
     }
@@ -362,13 +362,13 @@ public class AppleDisk implements Disk
       if (sectorSize == SECTOR_SIZE)                    // 256 byte sectors
       {
         int diskOffset = getBufferOffset (da);
-        hasData[da.getBlock ()] = check (diskOffset);
+        hasData[da.getBlockNo ()] = check (diskOffset);
       }
       else                                              // 512 byte blocks
       {
         int diskOffset1 = getBufferOffset (da, 0);
         int diskOffset2 = getBufferOffset (da, 1);
-        hasData[da.getBlock ()] = check (diskOffset1) || check (diskOffset2);
+        hasData[da.getBlockNo ()] = check (diskOffset1) || check (diskOffset2);
       }
     }
   }
@@ -389,7 +389,7 @@ public class AppleDisk implements Disk
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public int getSectorsPerTrack ()
+  public int getBlocksPerTrack ()
   // ---------------------------------------------------------------------------------//
   {
     return trackSize / sectorSize;
@@ -429,15 +429,15 @@ public class AppleDisk implements Disk
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public boolean isSectorEmpty (DiskAddress da)
+  public boolean isBlockEmpty (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
-    return !hasData[da.getBlock ()];
+    return !hasData[da.getBlockNo ()];
   }
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public boolean isSectorEmpty (int block)
+  public boolean isBlockEmpty (int block)
   // ---------------------------------------------------------------------------------//
   {
     return !hasData[block];
@@ -445,10 +445,10 @@ public class AppleDisk implements Disk
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public boolean isSectorEmpty (int track, int sector)
+  public boolean isBlockEmpty (int track, int sector)
   // ---------------------------------------------------------------------------------//
   {
-    return !hasData[getDiskAddress (track, sector).getBlock ()];
+    return !hasData[getDiskAddress (track, sector).getBlockNo ()];
   }
 
   //  @Override
@@ -479,7 +479,7 @@ public class AppleDisk implements Disk
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public byte[] readSector (DiskAddress da)
+  public byte[] readBlock (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
     byte[] buffer = new byte[sectorSize];
@@ -492,7 +492,7 @@ public class AppleDisk implements Disk
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public byte[] readSectors (List<DiskAddress> daList)
+  public byte[] readBlocks (List<DiskAddress> daList)
   // ---------------------------------------------------------------------------------//
   {
     byte[] buffer = new byte[daList.size () * sectorSize];
@@ -500,7 +500,7 @@ public class AppleDisk implements Disk
     for (DiskAddress da : daList)
     {
       // sparse text/PNT/PIC files may have gaps
-      if (da != null && (da.getBlock () > 0 || ((AppleDiskAddress) da).zeroFlag ()))
+      if (da != null && (da.getBlockNo () > 0 || ((AppleDiskAddress) da).zeroFlag ()))
         readBuffer (da, buffer, ptr);
       ptr += sectorSize;
     }
@@ -509,23 +509,23 @@ public class AppleDisk implements Disk
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public byte[] readSector (int track, int sector)
+  public byte[] readBlock (int track, int sector)
   // ---------------------------------------------------------------------------------//
   {
-    return readSector (getDiskAddress (track, sector));
+    return readBlock (getDiskAddress (track, sector));
   }
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public byte[] readSector (int block)
+  public byte[] readBlock (int block)
   // ---------------------------------------------------------------------------------//
   {
-    return readSector (getDiskAddress (block));
+    return readBlock (getDiskAddress (block));
   }
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public void writeSector (DiskAddress da, byte[] buffer)
+  public void writeBlock (DiskAddress da, byte[] buffer)
   // ---------------------------------------------------------------------------------//
   {
     writeBuffer (da, buffer);
@@ -644,7 +644,7 @@ public class AppleDisk implements Disk
   public boolean isValidAddress (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
-    return da != null && isValidAddress (da.getTrack (), da.getSector ());
+    return da != null && isValidAddress (da.getTrackNo (), da.getSectorNo ());
   }
 
   /*
@@ -708,8 +708,8 @@ public class AppleDisk implements Disk
   {
     assert sectorSize == SECTOR_SIZE;
 
-    return da.getTrack () * trackSize
-        + interleaveSector[interleave][da.getSector ()] * SECTOR_SIZE;
+    return da.getTrackNo () * trackSize
+        + interleaveSector[interleave][da.getSectorNo ()] * SECTOR_SIZE;
   }
 
   // ---------------------------------------------------------------------------------//
@@ -720,8 +720,8 @@ public class AppleDisk implements Disk
 
     assert seq == 0 || seq == 1;
 
-    return da.getTrack () * trackSize
-        + interleaveSector[interleave][da.getSector () * 2 + seq] * SECTOR_SIZE;
+    return da.getTrackNo () * trackSize
+        + interleaveSector[interleave][da.getSectorNo () * 2 + seq] * SECTOR_SIZE;
   }
 
   // ---------------------------------------------------------------------------------//
@@ -807,7 +807,7 @@ public class AppleDisk implements Disk
   public long getBootChecksum ()
   // ---------------------------------------------------------------------------------//
   {
-    byte[] buffer = readSector (0, 0);
+    byte[] buffer = readBlock (0, 0);
     Checksum checksum = new CRC32 ();
     checksum.update (buffer, 0, buffer.length);
     return checksum.getValue ();
diff --git a/src/com/bytezone/diskbrowser/disk/AppleDiskAddress.java b/src/com/bytezone/diskbrowser/disk/AppleDiskAddress.java
index e185565..25c74b2 100755
--- a/src/com/bytezone/diskbrowser/disk/AppleDiskAddress.java
+++ b/src/com/bytezone/diskbrowser/disk/AppleDiskAddress.java
@@ -17,7 +17,7 @@ public class AppleDiskAddress implements DiskAddress
   {
     this.owner = owner;
     this.block = block;
-    int sectorsPerTrack = owner.getSectorsPerTrack ();
+    int sectorsPerTrack = owner.getBlocksPerTrack ();
     if (sectorsPerTrack == 0)
     {
       track = 0;
@@ -38,7 +38,7 @@ public class AppleDiskAddress implements DiskAddress
     zeroFlag = (track & 0x40) != 0;
     this.track = track & 0x3F;
     this.sector = sector & 0x1F;
-    this.block = this.track * owner.getSectorsPerTrack () + this.sector;
+    this.block = this.track * owner.getBlocksPerTrack () + this.sector;
   }
 
   // ---------------------------------------------------------------------------------//
@@ -53,7 +53,7 @@ public class AppleDiskAddress implements DiskAddress
   public int compareTo (DiskAddress that)
   // ---------------------------------------------------------------------------------//
   {
-    return this.block - that.getBlock ();
+    return this.block - that.getBlockNo ();
   }
 
   // ---------------------------------------------------------------------------------//
@@ -63,12 +63,12 @@ public class AppleDiskAddress implements DiskAddress
   {
     if (that == null)
       return false;
-    return this.block == that.getBlock ();
+    return this.block == that.getBlockNo ();
   }
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public int getBlock ()
+  public int getBlockNo ()
   // ---------------------------------------------------------------------------------//
   {
     return block;
@@ -76,7 +76,7 @@ public class AppleDiskAddress implements DiskAddress
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public int getSector ()
+  public int getSectorNo ()
   // ---------------------------------------------------------------------------------//
   {
     return sector;
@@ -84,7 +84,7 @@ public class AppleDiskAddress implements DiskAddress
 
   // ---------------------------------------------------------------------------------//
   @Override
-  public int getTrack ()
+  public int getTrackNo ()
   // ---------------------------------------------------------------------------------//
   {
     return track;
diff --git a/src/com/bytezone/diskbrowser/disk/DefaultAppleFileSource.java b/src/com/bytezone/diskbrowser/disk/DefaultAppleFileSource.java
index 7c9d0d4..d5724ff 100755
--- a/src/com/bytezone/diskbrowser/disk/DefaultAppleFileSource.java
+++ b/src/com/bytezone/diskbrowser/disk/DefaultAppleFileSource.java
@@ -50,7 +50,7 @@ public class DefaultAppleFileSource implements AppleFileSource
     this (title, file, owner);
     this.blocks = blocks;
     if (file instanceof DefaultDataSource)
-      ((DefaultDataSource) file).buffer = owner.getDisk ().readSectors (blocks);
+      ((DefaultDataSource) file).buffer = owner.getDisk ().readBlocks (blocks);
   }
 
   // ---------------------------------------------------------------------------------//
@@ -59,7 +59,7 @@ public class DefaultAppleFileSource implements AppleFileSource
   {
     this.blocks = blocks;
     if (file instanceof DefaultDataSource)
-      ((DefaultDataSource) file).buffer = owner.getDisk ().readSectors (blocks);
+      ((DefaultDataSource) file).buffer = owner.getDisk ().readBlocks (blocks);
   }
 
   // ---------------------------------------------------------------------------------//
diff --git a/src/com/bytezone/diskbrowser/disk/Disk.java b/src/com/bytezone/diskbrowser/disk/Disk.java
index d66406b..f91bcbd 100755
--- a/src/com/bytezone/diskbrowser/disk/Disk.java
+++ b/src/com/bytezone/diskbrowser/disk/Disk.java
@@ -22,7 +22,7 @@ public interface Disk extends Iterable<DiskAddress>
 
   public int getTrackSize ();                   // bytes per track - 4096
 
-  public int getSectorsPerTrack ();             // 8 or 16
+  public int getBlocksPerTrack ();              // 8 or 16
 
   public void setInterleave (int interleave);
 
@@ -34,21 +34,21 @@ public interface Disk extends Iterable<DiskAddress>
 
   public DiskAddress getDiskAddress (int track, int sector);
 
-  public byte[] readSector (int block);
+  public byte[] readBlock (int block);
 
-  public byte[] readSector (int track, int sector);
+  public byte[] readBlock (int track, int sector);
 
-  public byte[] readSector (DiskAddress da);
+  public byte[] readBlock (DiskAddress da);
 
-  public byte[] readSectors (List<DiskAddress> daList);
+  public byte[] readBlocks (List<DiskAddress> daList);
 
-  public void writeSector (DiskAddress da, byte[] buffer);
+  public void writeBlock (DiskAddress da, byte[] buffer);
 
-  public boolean isSectorEmpty (int block);
+  public boolean isBlockEmpty (int block);
 
-  public boolean isSectorEmpty (int track, int sector);
+  public boolean isBlockEmpty (int track, int sector);
 
-  public boolean isSectorEmpty (DiskAddress da);
+  public boolean isBlockEmpty (DiskAddress da);
 
   public boolean isValidAddress (int block);
 
diff --git a/src/com/bytezone/diskbrowser/disk/DiskAddress.java b/src/com/bytezone/diskbrowser/disk/DiskAddress.java
index 46e5d59..eab52df 100755
--- a/src/com/bytezone/diskbrowser/disk/DiskAddress.java
+++ b/src/com/bytezone/diskbrowser/disk/DiskAddress.java
@@ -4,21 +4,21 @@ package com.bytezone.diskbrowser.disk;
 public interface DiskAddress extends Comparable<DiskAddress>
 // -----------------------------------------------------------------------------------//
 {
-  public int getBlock ();
+  public int getBlockNo ();
 
-  public int getTrack ();
+  public int getTrackNo ();
 
-  public int getSector ();
+  public int getSectorNo ();
 
   public Disk getDisk ();
 
   public boolean matches (DiskAddress other);
 
   // ---------------------------------------------------------------------------------//
-  public default byte[] readSector ()
+  public default byte[] readBlock ()
   // ---------------------------------------------------------------------------------//
   {
-    return getDisk ().readSector (this);
+    return getDisk ().readBlock (this);
   }
 
   // ---------------------------------------------------------------------------------//
diff --git a/src/com/bytezone/diskbrowser/disk/SectorList.java b/src/com/bytezone/diskbrowser/disk/SectorList.java
index dcae6fd..aa6f192 100755
--- a/src/com/bytezone/diskbrowser/disk/SectorList.java
+++ b/src/com/bytezone/diskbrowser/disk/SectorList.java
@@ -28,7 +28,7 @@ public class SectorList extends AbstractFile
     {
       if (!disk.isValidAddress (da))
         break;
-      byte[] tempBuffer = disk.readSector (da);
+      byte[] tempBuffer = disk.readBlock (da);
       System.arraycopy (tempBuffer, 0, buffer, ptr, disk.getBlockSize ());
       ptr += disk.getBlockSize ();
     }
@@ -50,7 +50,7 @@ public class SectorList extends AbstractFile
       if (owner == null)
         owner = "";
       text.append (
-          String.format (" %04X  %-18s  %s%n", da.getBlock (), sectorType.name, owner));
+          String.format (" %04X  %-18s  %s%n", da.getBlockNo (), sectorType.name, owner));
     }
 
     return text.toString ();
diff --git a/src/com/bytezone/diskbrowser/disk/SectorListConverter.java b/src/com/bytezone/diskbrowser/disk/SectorListConverter.java
index 13b7772..12cb7b1 100644
--- a/src/com/bytezone/diskbrowser/disk/SectorListConverter.java
+++ b/src/com/bytezone/diskbrowser/disk/SectorListConverter.java
@@ -45,7 +45,7 @@ public class SectorListConverter
 
     for (DiskAddress da : sectors)
     {
-      if (da.getBlock () == firstBlock + 1 + runLength)
+      if (da.getBlockNo () == firstBlock + 1 + runLength)
       {
         ++runLength;
         continue;
@@ -54,7 +54,7 @@ public class SectorListConverter
       if (firstBlock >= 0)
         addToText (text, firstBlock, runLength);
 
-      firstBlock = da.getBlock ();
+      firstBlock = da.getBlockNo ();
       runLength = 0;
     }
     addToText (text, firstBlock, runLength);
diff --git a/src/com/bytezone/diskbrowser/dos/AbstractCatalogEntry.java b/src/com/bytezone/diskbrowser/dos/AbstractCatalogEntry.java
index 4648619..06fda30 100644
--- a/src/com/bytezone/diskbrowser/dos/AbstractCatalogEntry.java
+++ b/src/com/bytezone/diskbrowser/dos/AbstractCatalogEntry.java
@@ -57,7 +57,10 @@ abstract class AbstractCatalogEntry implements AppleFileSource
     this.disk = dosDisk.getDisk ();
     this.catalogSectorDA = catalogSector;
 
+    name = getName ("", entryBuffer);
     reportedSize = HexFormatter.unsignedShort (entryBuffer, 33);
+    if (reportedSize == 0)
+      System.out.printf ("%s size 0%n", name);
 
     int type = entryBuffer[2] & 0x7F;
     locked = (entryBuffer[2] & 0x80) != 0;
@@ -81,13 +84,12 @@ abstract class AbstractCatalogEntry implements AppleFileSource
     else
       System.out.println ("Unknown file type : " + type);
 
-    name = getName ("", entryBuffer);
     if (dosDisk.getVersion () >= 0x41)
       lastModified = Utility.getDateTime (entryBuffer, 0x1B);
 
     // CATALOG command only formats the LO byte - see Beneath Apple DOS pp4-6
-    String base = String.format ("%s%s %03d ", (locked) ? "*" : " ", getFileType (),
-        (entryBuffer[33] & 0xFF));
+    String base =
+        String.format ("%s%s %03d ", (locked) ? "*" : " ", getFileType (), reportedSize);
     catalogName = getName (base, entryBuffer).replace ("^", "");
   }
 
@@ -96,9 +98,11 @@ abstract class AbstractCatalogEntry implements AppleFileSource
   // ---------------------------------------------------------------------------------//
   {
     StringBuilder text = new StringBuilder (base);
+
     int max = buffer[0] == (byte) 0xFF ? 32 : 33;
     if (dosDisk.getVersion () >= 0x41)
       max = 27;
+
     for (int i = 3; i < max; i++)
     {
       int c = buffer[i] & 0xFF;
@@ -115,8 +119,10 @@ abstract class AbstractCatalogEntry implements AppleFileSource
       else
         text.append ((char) c);                     // standard ascii
     }
+
     while (text.length () > 0 && text.charAt (text.length () - 1) == ' ')
       text.deleteCharAt (text.length () - 1);       // rtrim()
+
     return text.toString ();
   }
 
@@ -167,7 +173,7 @@ abstract class AbstractCatalogEntry implements AppleFileSource
     if (appleFile != null)
       return appleFile;
 
-    byte[] buffer = disk.readSectors (dataSectors);
+    byte[] buffer = disk.readBlocks (dataSectors);
     int reportedLength;
     if (buffer.length == 0)
     {
@@ -240,7 +246,7 @@ abstract class AbstractCatalogEntry implements AppleFileSource
             appleFile = new DoubleHiResImage (name, exactBuffer);
           else if (link != null)
           {
-            byte[] auxBuffer = link.disk.readSectors (link.dataSectors);
+            byte[] auxBuffer = link.disk.readBlocks (link.dataSectors);
             byte[] exactAuxBuffer = getExactBuffer (auxBuffer);
             if (name.endsWith (".AUX"))
               appleFile = new DoubleHiResImage (name, exactAuxBuffer, exactBuffer);
diff --git a/src/com/bytezone/diskbrowser/dos/CatalogEntry.java b/src/com/bytezone/diskbrowser/dos/CatalogEntry.java
index 495bd2b..0303173 100644
--- a/src/com/bytezone/diskbrowser/dos/CatalogEntry.java
+++ b/src/com/bytezone/diskbrowser/dos/CatalogEntry.java
@@ -19,18 +19,19 @@ class CatalogEntry extends AbstractCatalogEntry
   {
     super (dosDisk, catalogSector, entryBuffer); // build lists of ts and data sectors
 
-    if (reportedSize > 0 && disk.isValidAddress (entryBuffer[0], entryBuffer[1]))
+    //    if (reportedSize > 0 && disk.isValidAddress (entryBuffer[0], entryBuffer[1]))
+    if (disk.isValidAddress (entryBuffer[0], entryBuffer[1]))
     {
       // Get address of first TS-list sector
       DiskAddress da = disk.getDiskAddress (entryBuffer[0], entryBuffer[1]);
 
       // Loop through all TS-list sectors
-      loop: while (da.getBlock () > 0 || ((AppleDiskAddress) da).zeroFlag ())
+      loop: while (da.getBlockNo () > 0 || ((AppleDiskAddress) da).zeroFlag ())
       {
         if (dosDisk.stillAvailable (da))
         {
           if (isValidCatalogSector (da))
-            dosDisk.sectorTypes[da.getBlock ()] = dosDisk.tsListSector;
+            dosDisk.sectorTypes[da.getBlockNo ()] = dosDisk.tsListSector;
           else
           {
             System.out.printf ("Attempt to assign invalid TS sector " + ": %s from %s%n",
@@ -46,7 +47,7 @@ class CatalogEntry extends AbstractCatalogEntry
           break;
         }
         tsSectors.add (da);
-        byte[] sectorBuffer = disk.readSector (da);
+        byte[] sectorBuffer = disk.readBlock (da);
 
         int startPtr = 12;
         // the tsList *should* start at 0xC0, but some disks start in the unused bytes
@@ -69,7 +70,7 @@ class CatalogEntry extends AbstractCatalogEntry
                 i, sectorBuffer[i], sectorBuffer[i + 1], name.trim ());
             break loop;
           }
-          if (da.getBlock () == 0 && !((AppleDiskAddress) da).zeroFlag ())
+          if (da.getBlockNo () == 0 && !((AppleDiskAddress) da).zeroFlag ())
           {
             if (fileType != FileType.Text)
               break;
@@ -80,7 +81,7 @@ class CatalogEntry extends AbstractCatalogEntry
           {
             dataSectors.add (da);
             if (dosDisk.stillAvailable (da))
-              dosDisk.sectorTypes[da.getBlock ()] = dosDisk.dataSector;
+              dosDisk.sectorTypes[da.getBlockNo ()] = dosDisk.dataSector;
             else
             {
               System.out
@@ -125,7 +126,7 @@ class CatalogEntry extends AbstractCatalogEntry
     }
     else if (dataSectors.size () > 0)       // get the file length
     {
-      byte[] buffer = disk.readSector (dataSectors.get (0));
+      byte[] buffer = disk.readBlock (dataSectors.get (0));
       switch (fileType)
       {
         case IntegerBasic:
@@ -144,13 +145,13 @@ class CatalogEntry extends AbstractCatalogEntry
   private boolean isValidCatalogSector (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
-    byte[] buffer = da.readSector ();
+    byte[] buffer = da.readBlock ();
 
     if (!da.getDisk ().isValidAddress (buffer[1], buffer[2]))
       return false;
     if (buffer[3] != 0 || buffer[4] != 0)         // not supposed to be used
       // Diags2E.dsk stores its own sector address here
-      if (da.getTrack () != (buffer[3] & 0xFF) && da.getSector () != (buffer[4] & 0xFF))
+      if (da.getTrackNo () != (buffer[3] & 0xFF) && da.getSectorNo () != (buffer[4] & 0xFF))
         return false;
 
     return true;
diff --git a/src/com/bytezone/diskbrowser/dos/DeletedCatalogEntry.java b/src/com/bytezone/diskbrowser/dos/DeletedCatalogEntry.java
index 40b9a84..3330039 100644
--- a/src/com/bytezone/diskbrowser/dos/DeletedCatalogEntry.java
+++ b/src/com/bytezone/diskbrowser/dos/DeletedCatalogEntry.java
@@ -42,7 +42,7 @@ class DeletedCatalogEntry extends AbstractCatalogEntry
     }
     int totalBlocks = 0;
 
-    if (reportedSize <= 1 || !disk.isValidAddress (da.getTrack (), da.getSector ()))
+    if (reportedSize <= 1 || !disk.isValidAddress (da.getTrackNo (), da.getSectorNo ()))
     {
       if (debug)
         System.out.println ("invalid catalog entry");
@@ -51,7 +51,7 @@ class DeletedCatalogEntry extends AbstractCatalogEntry
     }
 
     // Loop through all TS-list sectors
-    loop: while (da.getBlock () > 0 || ((AppleDiskAddress) da).zeroFlag ())
+    loop: while (da.getBlockNo () > 0 || ((AppleDiskAddress) da).zeroFlag ())
     {
       if (!dosDisk.stillAvailable (da))
       {
@@ -61,16 +61,16 @@ class DeletedCatalogEntry extends AbstractCatalogEntry
       tsSectors.add (da);
       totalBlocks++;
 
-      byte[] sectorBuffer = disk.readSector (da);
+      byte[] sectorBuffer = disk.readBlock (da);
       for (int i = 12, max = disk.getBlockSize (); i < max; i += 2)
       {
         da = getValidAddress (sectorBuffer, i);
         if (da == null)
           break loop;
-        if (da.getBlock () > 0 && debug)
+        if (da.getBlockNo () > 0 && debug)
           System.out.println (da);
 
-        if (da.getBlock () > 0 || ((AppleDiskAddress) da).zeroFlag ())
+        if (da.getBlockNo () > 0 || ((AppleDiskAddress) da).zeroFlag ())
         {
           if (!dosDisk.stillAvailable (da))
           {
diff --git a/src/com/bytezone/diskbrowser/dos/DosDisk.java b/src/com/bytezone/diskbrowser/dos/DosDisk.java
index 36e7944..9d06684 100755
--- a/src/com/bytezone/diskbrowser/dos/DosDisk.java
+++ b/src/com/bytezone/diskbrowser/dos/DosDisk.java
@@ -71,20 +71,20 @@ public class DosDisk extends AbstractFormattedDisk
     sectorTypesList.add (dataSector);
 
     DiskAddress da = disk.getDiskAddress (0, 0);
-    byte[] sectorBuffer = disk.readSector (da);               // Boot sector
+    byte[] sectorBuffer = disk.readBlock (da);               // Boot sector
     bootSector = new BootSector (disk, sectorBuffer, "DOS", da);
 
     da = disk.getDiskAddress (CATALOG_TRACK, VTOC_SECTOR);
-    sectorBuffer = disk.readSector (da);          // VTOC
+    sectorBuffer = disk.readBlock (da);          // VTOC
     dosVTOCSector = new DosVTOCSector (this, disk, sectorBuffer, da);
-    sectorTypes[da.getBlock ()] = vtocSector;
+    sectorTypes[da.getBlockNo ()] = vtocSector;
 
     DiskAddress catalogStart = disk.getDiskAddress (sectorBuffer[1], sectorBuffer[2]);
 
     if (dosVTOCSector.sectorSize != disk.getBlockSize ())
       System.out.printf ("%s - invalid sector size : %d%n", disk.getFile ().getName (),
           dosVTOCSector.sectorSize);
-    if (dosVTOCSector.maxSectors != disk.getSectorsPerTrack ())
+    if (dosVTOCSector.maxSectors != disk.getBlocksPerTrack ())
       System.out.printf ("%s - invalid sectors per track : %d%n",
           disk.getFile ().getName (), dosVTOCSector.maxSectors);
 
@@ -105,12 +105,12 @@ public class DosDisk extends AbstractFormattedDisk
     rootNode.add (volumeNode);
 
     // flag the catalog sectors before any file mistakenly grabs them
-    da = disk.getDiskAddress (catalogStart.getBlock ());
+    da = disk.getDiskAddress (catalogStart.getBlockNo ());
     do
     {
       if (!disk.isValidAddress (da))
         break;
-      sectorBuffer = disk.readSector (da);
+      sectorBuffer = disk.readBlock (da);
       if (!disk.isValidAddress (sectorBuffer[1], sectorBuffer[2]))
         break;
 
@@ -123,7 +123,7 @@ public class DosDisk extends AbstractFormattedDisk
       //        break;
       //      }
 
-      sectorTypes[da.getBlock ()] = catalogSector;
+      sectorTypes[da.getBlockNo ()] = catalogSector;
 
       int track = sectorBuffer[1] & 0xFF;
       int sector = sectorBuffer[2] & 0xFF;
@@ -132,15 +132,15 @@ public class DosDisk extends AbstractFormattedDisk
 
       da = disk.getDiskAddress (track, sector);
 
-    } while (da.getBlock () != 0);
+    } while (da.getBlockNo () != 0);
 
     // same loop, but now all the catalog sectors are properly flagged
-    da = disk.getDiskAddress (catalogStart.getBlock ());
+    da = disk.getDiskAddress (catalogStart.getBlockNo ());
     do
     {
       if (!disk.isValidAddress (da))
         break;
-      sectorBuffer = disk.readSector (da);
+      sectorBuffer = disk.readBlock (da);
       if (!disk.isValidAddress (sectorBuffer[1], sectorBuffer[2]))
         break;
 
@@ -186,7 +186,7 @@ public class DosDisk extends AbstractFormattedDisk
 
       da = disk.getDiskAddress (sectorBuffer[1], sectorBuffer[2]);
 
-    } while (da.getBlock () != 0);
+    } while (da.getBlockNo () != 0);
 
     // link double hi-res files
     for (AppleFileSource fe : fileEntries)
@@ -210,7 +210,7 @@ public class DosDisk extends AbstractFormattedDisk
     int lastDosSector = dosVTOCSector.maxSectors * 3;       // first three tracks
     for (DiskAddress da2 : disk)
     {
-      int blockNo = da2.getBlock ();
+      int blockNo = da2.getBlockNo ();
       if (blockNo < lastDosSector) // in the DOS region
       {
         if (freeBlocks.get (blockNo))                       // according to the VTOC
@@ -277,7 +277,7 @@ public class DosDisk extends AbstractFormattedDisk
       return true;
     }
 
-    if (disk.getSectorsPerTrack () > 16)
+    if (disk.getBlocksPerTrack () > 16)
       return false;
 
     int[] cb = new int[3];
@@ -342,7 +342,7 @@ public class DosDisk extends AbstractFormattedDisk
   private static int checkFormat (AppleDisk disk)
   // ---------------------------------------------------------------------------------//
   {
-    byte[] buffer = disk.readSector (0x11, 0x00);
+    byte[] buffer = disk.readBlock (0x11, 0x00);
 
     // DISCCOMMANDER.DSK uses track 0x17 for the catalog
     //    if (buffer[1] != 0x11) // first catalog track
@@ -386,7 +386,7 @@ public class DosDisk extends AbstractFormattedDisk
   // ---------------------------------------------------------------------------------//
   {
     DiskAddress catalogStart = disk.getDiskAddress (buffer[1], buffer[2]);
-    DiskAddress da = disk.getDiskAddress (catalogStart.getBlock ());
+    DiskAddress da = disk.getDiskAddress (catalogStart.getBlockNo ());
     List<DiskAddress> catalogAddresses = new ArrayList<> ();
 
     do
@@ -408,7 +408,7 @@ public class DosDisk extends AbstractFormattedDisk
         return 0;
       }
 
-      buffer = disk.readSector (da);
+      buffer = disk.readBlock (da);
       if (!disk.isValidAddress (buffer[1], buffer[2]))
       {
         if (debug)
@@ -420,7 +420,7 @@ public class DosDisk extends AbstractFormattedDisk
 
       da = disk.getDiskAddress (buffer[1], buffer[2]);
 
-    } while (da.getBlock () != 0);
+    } while (da.getBlockNo () != 0);
 
     if (debug)
       System.out.printf ("Catalog blocks: %d%n", catalogAddresses.size ());
@@ -432,7 +432,7 @@ public class DosDisk extends AbstractFormattedDisk
   // ---------------------------------------------------------------------------------//
   {
     for (DiskAddress diskAddress : catalogAddresses)
-      if (diskAddress.getBlock () == da.getBlock ())
+      if (diskAddress.getBlockNo () == da.getBlockNo ())
         return true;
     return false;
   }
@@ -460,14 +460,14 @@ public class DosDisk extends AbstractFormattedDisk
   public DataSource getFormattedSector (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
-    SectorType type = sectorTypes[da.getBlock ()];
+    SectorType type = sectorTypes[da.getBlockNo ()];
     if (type == vtocSector)
       return dosVTOCSector;
-    if (da.getBlock () == 0)
+    if (da.getBlockNo () == 0)
       return bootSector;
 
-    byte[] buffer = disk.readSector (da);
-    String address = String.format ("%02X %02X", da.getTrack (), da.getSector ());
+    byte[] buffer = disk.readBlock (da);
+    String address = String.format ("%02X %02X", da.getTrackNo (), da.getSectorNo ());
 
     if (type == tsListSector)
       return new DosTSListSector (getSectorFilename (da), disk, buffer, da);
diff --git a/src/com/bytezone/diskbrowser/dos/DosTSListSector.java b/src/com/bytezone/diskbrowser/dos/DosTSListSector.java
index 543d566..f71a762 100755
--- a/src/com/bytezone/diskbrowser/dos/DosTSListSector.java
+++ b/src/com/bytezone/diskbrowser/dos/DosTSListSector.java
@@ -36,7 +36,7 @@ class DosTSListSector extends AbstractSector
         break;            // throw exception?
       }
 
-      if (da.getBlock () > 0 && dosDisk.stillAvailable (da))
+      if (da.getBlockNo () > 0 && dosDisk.stillAvailable (da))
       {
         System.out.println ("Invalid sector address : " + da);
         break;            // throw exception?
@@ -72,8 +72,8 @@ class DosTSListSector extends AbstractSector
 
     if ((buffer[3] != 0 || buffer[4] != 0)         // not supposed to be used
         // Diags2E.dsk stores its own sector address here
-        && (diskAddress.getTrack () == (buffer[3] & 0xFF)
-            && diskAddress.getSector () == (buffer[4] & 0xFF)))
+        && (diskAddress.getTrackNo () == (buffer[3] & 0xFF)
+            && diskAddress.getSectorNo () == (buffer[4] & 0xFF)))
       addText (text, buffer, 3, 2, "Self-reference");
     else
       addText (text, buffer, 3, 2, "Not used");
diff --git a/src/com/bytezone/diskbrowser/dos/DosVTOCSector.java b/src/com/bytezone/diskbrowser/dos/DosVTOCSector.java
index 7c00acf..a4b0d2e 100755
--- a/src/com/bytezone/diskbrowser/dos/DosVTOCSector.java
+++ b/src/com/bytezone/diskbrowser/dos/DosVTOCSector.java
@@ -76,7 +76,7 @@ class DosVTOCSector extends AbstractSector
     addTextAndDecimal (text, buffer, 53, 1, "Maximum sectors");
     addTextAndDecimal (text, buffer, 54, 2, "Bytes per sector");
 
-    boolean bootSectorEmpty = parentDisk.getDisk ().isSectorEmpty (0);
+    boolean bootSectorEmpty = parentDisk.getDisk ().isBlockEmpty (0);
     int firstSector = 0x38;
     int max = maxTracks * 4 + firstSector;
     for (int i = firstSector; i < max; i += 4)
@@ -135,7 +135,7 @@ class DosVTOCSector extends AbstractSector
     addTextAndDecimal (text, buffer, 0x35, 1, "Maximum sectors");
     addTextAndDecimal (text, buffer, 0x36, 2, "Bytes per sector");
 
-    boolean bootSectorEmpty = parentDisk.getDisk ().isSectorEmpty (0);
+    boolean bootSectorEmpty = parentDisk.getDisk ().isBlockEmpty (0);
     int firstSector = 0x38;
     int max = maxTracks * 4 + firstSector;
     for (int i = firstSector; i < max; i += 4)
diff --git a/src/com/bytezone/diskbrowser/gui/DiskLayoutPanel.java b/src/com/bytezone/diskbrowser/gui/DiskLayoutPanel.java
index 3701eb6..7c0902d 100644
--- a/src/com/bytezone/diskbrowser/gui/DiskLayoutPanel.java
+++ b/src/com/bytezone/diskbrowser/gui/DiskLayoutPanel.java
@@ -183,8 +183,8 @@ class DiskLayoutPanel extends JPanel
 
     public Rectangle getLocation (DiskAddress da)
     {
-      int y = da.getBlock () / grid.width;
-      int x = da.getBlock () % grid.width;
+      int y = da.getBlockNo () / grid.width;
+      int x = da.getBlockNo () % grid.width;
       Rectangle r =
           new Rectangle (x * block.width, y * block.height, block.width, block.height);
       return r;
diff --git a/src/com/bytezone/diskbrowser/gui/DiskLayoutSelection.java b/src/com/bytezone/diskbrowser/gui/DiskLayoutSelection.java
index 77911b5..66bfb2b 100755
--- a/src/com/bytezone/diskbrowser/gui/DiskLayoutSelection.java
+++ b/src/com/bytezone/diskbrowser/gui/DiskLayoutSelection.java
@@ -97,28 +97,28 @@ class DiskLayoutSelection implements Iterable<DiskAddress>
     switch (e.getKeyCode ())
     {
       case KeyEvent.VK_LEFT:
-        int block = first.getBlock () - 1;
+        int block = first.getBlockNo () - 1;
         if (block < 0)
           block = totalBlocks - 1;
         addHighlight (disk.getDiskAddress (block));
         break;
 
       case KeyEvent.VK_RIGHT:
-        block = last.getBlock () + 1;
+        block = last.getBlockNo () + 1;
         if (block >= totalBlocks)
           block = 0;
         addHighlight (disk.getDiskAddress (block));
         break;
 
       case KeyEvent.VK_UP:
-        block = first.getBlock () - rowSize;
+        block = first.getBlockNo () - rowSize;
         if (block < 0)
           block += totalBlocks;
         addHighlight (disk.getDiskAddress (block));
         break;
 
       case KeyEvent.VK_DOWN:
-        block = last.getBlock () + rowSize;
+        block = last.getBlockNo () + rowSize;
         if (block >= totalBlocks)
           block -= totalBlocks;
         addHighlight (disk.getDiskAddress (block));
@@ -169,7 +169,7 @@ class DiskLayoutSelection implements Iterable<DiskAddress>
     highlights.clear ();
     if (list != null)
       for (DiskAddress da : list)
-        if (da != null && (da.getBlock () > 0 || ((AppleDiskAddress) da).zeroFlag ()))
+        if (da != null && (da.getBlockNo () > 0 || ((AppleDiskAddress) da).zeroFlag ()))
           highlights.add (da);
   }
 
@@ -177,8 +177,8 @@ class DiskLayoutSelection implements Iterable<DiskAddress>
   private boolean checkContiguous ()
   // ---------------------------------------------------------------------------------//
   {
-    int range = highlights.get (highlights.size () - 1).getBlock ()
-        - highlights.get (0).getBlock () + 1;
+    int range = highlights.get (highlights.size () - 1).getBlockNo ()
+        - highlights.get (0).getBlockNo () + 1;
     return (range == highlights.size ());
   }
 
@@ -189,16 +189,16 @@ class DiskLayoutSelection implements Iterable<DiskAddress>
     int lo, hi;
 
     // Are we extending in front of the current block?
-    if (highlights.get (0).getBlock () > da.getBlock ())
+    if (highlights.get (0).getBlockNo () > da.getBlockNo ())
     {
-      lo = da.getBlock ();
-      hi = highlights.get (0).getBlock () - 1;
+      lo = da.getBlockNo ();
+      hi = highlights.get (0).getBlockNo () - 1;
     }
     else
     // No, must be extending at the end
     {
-      lo = highlights.get (highlights.size () - 1).getBlock () + 1;
-      hi = da.getBlock ();
+      lo = highlights.get (highlights.size () - 1).getBlockNo () + 1;
+      hi = da.getBlockNo ();
     }
 
     for (int i = lo; i <= hi; i++)
@@ -210,8 +210,8 @@ class DiskLayoutSelection implements Iterable<DiskAddress>
   // ---------------------------------------------------------------------------------//
   {
     // If we are outside the discontiguous range, just extend as usual
-    if (da.getBlock () < highlights.get (0).getBlock ()
-        || da.getBlock () > highlights.get (highlights.size () - 1).getBlock ())
+    if (da.getBlockNo () < highlights.get (0).getBlockNo ()
+        || da.getBlockNo () > highlights.get (highlights.size () - 1).getBlockNo ())
     {
       extendHighlights (disk, da);
       return;
diff --git a/src/com/bytezone/diskbrowser/gui/SaveSectorsAction.java b/src/com/bytezone/diskbrowser/gui/SaveSectorsAction.java
index 0c45654..d344f55 100644
--- a/src/com/bytezone/diskbrowser/gui/SaveSectorsAction.java
+++ b/src/com/bytezone/diskbrowser/gui/SaveSectorsAction.java
@@ -36,7 +36,7 @@ class SaveSectorsAction extends DefaultAction implements SectorSelectionListener
       return;
     }
     byte[] buffer =
-        event.getFormattedDisk ().getDisk ().readSectors (event.getSectors ());
+        event.getFormattedDisk ().getDisk ().readBlocks (event.getSectors ());
 
     JFileChooser fileChooser = new JFileChooser ();
     fileChooser.setDialogTitle ("Save sectors");
diff --git a/src/com/bytezone/diskbrowser/infocom/InfocomDisk.java b/src/com/bytezone/diskbrowser/infocom/InfocomDisk.java
index 09d9728..6f8e92b 100755
--- a/src/com/bytezone/diskbrowser/infocom/InfocomDisk.java
+++ b/src/com/bytezone/diskbrowser/infocom/InfocomDisk.java
@@ -54,7 +54,7 @@ public class InfocomDisk extends AbstractFormattedDisk
 
     setInfocomSectorTypes ();
 
-    data = disk.readSector (3, 0);          // read first sector to get file size
+    data = disk.readBlock (3, 0);          // read first sector to get file size
     data = getBuffer (getWord (26) * 2);    // read entire file into data buffer
 
     if (false)
@@ -131,7 +131,7 @@ public class InfocomDisk extends AbstractFormattedDisk
 
     for (int track = 0; track < 3; track++)
       for (int sector = 0; sector < 16; sector++)
-        if (!disk.isSectorEmpty (track, sector))
+        if (!disk.isBlockEmpty (track, sector))
           sectorTypes[track * 16 + sector] = bootSector;
   }
 
@@ -148,7 +148,7 @@ public class InfocomDisk extends AbstractFormattedDisk
     while (blockNo <= blockTo)
     {
       blocks.add (disk.getDiskAddress (blockNo));
-      if (!disk.isSectorEmpty (blockNo))
+      if (!disk.isBlockEmpty (blockNo))
         sectorTypes[blockNo] = type;
       blockNo++;
     }
@@ -164,11 +164,11 @@ public class InfocomDisk extends AbstractFormattedDisk
     int fileSize = 0;
     for (DiskAddress da : disk)
     {
-      if (da.getBlock () > startBlock && disk.isSectorEmpty (da))
+      if (da.getBlockNo () > startBlock && disk.isBlockEmpty (da))
       {
         System.out.println ("Empty : " + da);
-        buffer = disk.readSector (da.getBlock () - 1);
-        fileSize = (da.getBlock () - 48) * disk.getBlockSize ();
+        buffer = disk.readBlock (da.getBlockNo () - 1);
+        fileSize = (da.getBlockNo () - 48) * disk.getBlockSize ();
         break;
       }
     }
@@ -193,7 +193,7 @@ public class InfocomDisk extends AbstractFormattedDisk
     for (int track = 3, ptr = 0; track < 35; track++)
       for (int sector = 0; sector < 16; sector++, ptr += BLOCK_SIZE)
       {
-        byte[] temp = disk.readSector (track, sector);
+        byte[] temp = disk.readBlock (track, sector);
         int spaceLeft = fileSize - ptr;
         if (spaceLeft <= BLOCK_SIZE)
         {
@@ -247,7 +247,7 @@ public class InfocomDisk extends AbstractFormattedDisk
   public static boolean checkFormat (AppleDisk disk)
   // ---------------------------------------------------------------------------------//
   {
-    byte[] buffer = disk.readSector (3, 0);
+    byte[] buffer = disk.readBlock (3, 0);
 
     int version = buffer[0] & 0xFF;
     int highMemory = HexFormatter.intValue (buffer[5], buffer[4]);
diff --git a/src/com/bytezone/diskbrowser/pascal/FileEntry.java b/src/com/bytezone/diskbrowser/pascal/FileEntry.java
index f7d814e..ab9541d 100644
--- a/src/com/bytezone/diskbrowser/pascal/FileEntry.java
+++ b/src/com/bytezone/diskbrowser/pascal/FileEntry.java
@@ -120,7 +120,7 @@ public class FileEntry extends CatalogEntry
   private byte[] getExactBuffer ()
   // ---------------------------------------------------------------------------------//
   {
-    byte[] buffer = parent.getDisk ().readSectors (blocks);
+    byte[] buffer = parent.getDisk ().readBlocks (blocks);
     byte[] exactBuffer;
 
     if (buffer.length > 0 && bytesUsedInLastBlock < 512)
diff --git a/src/com/bytezone/diskbrowser/pascal/PascalDisk.java b/src/com/bytezone/diskbrowser/pascal/PascalDisk.java
index 0870136..f50f144 100755
--- a/src/com/bytezone/diskbrowser/pascal/PascalDisk.java
+++ b/src/com/bytezone/diskbrowser/pascal/PascalDisk.java
@@ -65,10 +65,10 @@ public class PascalDisk extends AbstractFormattedDisk
     sectorTypesList.add (badSector);
 
     List<DiskAddress> blocks = disk.getDiskAddressList (0, 1);    // B0, B1
-    this.bootSector = new BootSector (disk, disk.readSectors (blocks), "Pascal");
+    this.bootSector = new BootSector (disk, disk.readBlocks (blocks), "Pascal");
 
     for (int i = 0; i < 2; i++)
-      if (!disk.isSectorEmpty (i))
+      if (!disk.isBlockEmpty (i))
       {
         sectorTypes[i] = diskBootSector;
         freeBlocks.set (i, false);
@@ -77,7 +77,7 @@ public class PascalDisk extends AbstractFormattedDisk
     for (int i = 2; i < disk.getTotalBlocks (); i++)
       freeBlocks.set (i, true);
 
-    byte[] buffer = disk.readSector (2);
+    byte[] buffer = disk.readBlock (2);
     byte[] data = new byte[CATALOG_ENTRY_SIZE];
     System.arraycopy (buffer, 0, data, 0, CATALOG_ENTRY_SIZE);
     volumeEntry = new VolumeEntry (this, data);
@@ -91,20 +91,20 @@ public class PascalDisk extends AbstractFormattedDisk
     for (int i = 2; i < max; i++)
     {
       DiskAddress da = disk.getDiskAddress (i);
-      if (!disk.isSectorEmpty (da))
+      if (!disk.isBlockEmpty (da))
         sectorTypes[i] = catalogSector;
       sectors.add (da);
       freeBlocks.set (i, false);
     }
 
     diskCatalogSector =
-        new PascalCatalogSector (disk, disk.readSectors (sectors), sectors);
+        new PascalCatalogSector (disk, disk.readBlocks (sectors), sectors);
 
     // read the catalog
     List<DiskAddress> addresses = new ArrayList<> ();
     for (int i = 2; i < max; i++)
       addresses.add (disk.getDiskAddress (i));
-    buffer = disk.readSectors (addresses);
+    buffer = disk.readBlocks (addresses);
 
     // loop through each catalog entry (what if there are deleted files?)
     for (int i = 1; i <= volumeEntry.totalFiles; i++)
@@ -152,7 +152,7 @@ public class PascalDisk extends AbstractFormattedDisk
   public static boolean checkFormat (AppleDisk disk, boolean debug)
   // ---------------------------------------------------------------------------------//
   {
-    byte[] buffer = disk.readSector (2);
+    byte[] buffer = disk.readBlock (2);
     int nameLength = buffer[6] & 0xFF;
     if (nameLength < 1 || nameLength > 7)
     {
@@ -187,7 +187,7 @@ public class PascalDisk extends AbstractFormattedDisk
     List<DiskAddress> addresses = new ArrayList<> ();
     for (int i = 2; i < to; i++)
       addresses.add (disk.getDiskAddress (i));
-    buffer = disk.readSectors (addresses);
+    buffer = disk.readBlocks (addresses);
 
     int files = HexFormatter.intValue (buffer[16], buffer[17]);
     if (files < 0 || files > 77)
@@ -228,14 +228,14 @@ public class PascalDisk extends AbstractFormattedDisk
   public DataSource getFormattedSector (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
-    SectorType st = sectorTypes[da.getBlock ()];
+    SectorType st = sectorTypes[da.getBlockNo ()];
     if (st == diskBootSector)
       return bootSector;
     if (st == catalogSector)
       return diskCatalogSector;
     String name = getSectorFilename (da);
     if (name != null)
-      return new DefaultSector (name, disk, disk.readSector (da), da);
+      return new DefaultSector (name, disk, disk.readBlock (da), da);
     return super.getFormattedSector (da);
   }
 
diff --git a/src/com/bytezone/diskbrowser/pascal/VolumeEntry.java b/src/com/bytezone/diskbrowser/pascal/VolumeEntry.java
index 36b2ded..ff1543e 100644
--- a/src/com/bytezone/diskbrowser/pascal/VolumeEntry.java
+++ b/src/com/bytezone/diskbrowser/pascal/VolumeEntry.java
@@ -30,7 +30,7 @@ class VolumeEntry extends CatalogEntry
     if (file != null)
       return file;
 
-    byte[] buffer = parent.getDisk ().readSectors (blocks);
+    byte[] buffer = parent.getDisk ().readBlocks (blocks);
     file = new DefaultAppleFile (name, buffer);
 
     return file;
diff --git a/src/com/bytezone/diskbrowser/prodos/FileEntry.java b/src/com/bytezone/diskbrowser/prodos/FileEntry.java
index 5cca2a7..73bb46a 100755
--- a/src/com/bytezone/diskbrowser/prodos/FileEntry.java
+++ b/src/com/bytezone/diskbrowser/prodos/FileEntry.java
@@ -102,7 +102,7 @@ class FileEntry extends CatalogEntry implements ProdosConstants
           if (diskAddress == null)
             break;
           dataBlocks.add (diskAddress);
-          byte[] buffer = disk.readSector (block);
+          byte[] buffer = disk.readBlock (block);
           block = HexFormatter.unsignedShort (buffer, 2);
         } while (block > 0);
         break;
@@ -125,7 +125,7 @@ class FileEntry extends CatalogEntry implements ProdosConstants
     parentDisk.setSectorType (keyPtr, parentDisk.extendedKeySector);
     indexBlocks.add (disk.getDiskAddress (keyPtr));
 
-    byte[] buffer2 = disk.readSector (keyPtr);        // data fork and resource fork
+    byte[] buffer2 = disk.readBlock (keyPtr);        // data fork and resource fork
 
     // read 2 mini entries (data fork & resource fork)
     for (int i = 0; i < 512; i += 256)
@@ -194,7 +194,7 @@ class FileEntry extends CatalogEntry implements ProdosConstants
       parentDisk.setSectorType (blockPtr, parentDisk.indexSector);
       indexBlocks.add (disk.getDiskAddress (blockPtr));
 
-      byte[] buffer = disk.readSector (blockPtr);
+      byte[] buffer = disk.readBlock (blockPtr);
       for (int i = 0; i < 256; i++)
       {
         int blockNo = (buffer[i] & 0xFF) | ((buffer[i + 0x100] & 0xFF) << 8);
@@ -213,7 +213,7 @@ class FileEntry extends CatalogEntry implements ProdosConstants
     parentDisk.setSectorType (keyPtr, parentDisk.masterIndexSector);
     indexBlocks.add (disk.getDiskAddress (keyPtr));
 
-    byte[] buffer = disk.readSector (keyPtr);                   // master index
+    byte[] buffer = disk.readBlock (keyPtr);                   // master index
 
     int highest = 0x80;
     while (highest-- > 0)                                       // decrement after test
@@ -537,7 +537,7 @@ class FileEntry extends CatalogEntry implements ProdosConstants
     List<DiskAddress> addresses = new ArrayList<> ();
     int logicalBlock = 0;
 
-    byte[] mainIndexBuffer = disk.readSector (keyPtr);
+    byte[] mainIndexBuffer = disk.readBlock (keyPtr);
     for (int i = 0; i < 256; i++)
     {
       int indexBlock =
@@ -548,7 +548,7 @@ class FileEntry extends CatalogEntry implements ProdosConstants
       {
         if (addresses.size () > 0)
         {
-          byte[] tempBuffer = disk.readSectors (addresses);
+          byte[] tempBuffer = disk.readBlocks (addresses);
           buffers.add (
               new TextBuffer (tempBuffer, auxType, logicalBlock - addresses.size ()));
           addresses.clear ();
@@ -603,24 +603,24 @@ class FileEntry extends CatalogEntry implements ProdosConstants
       case SEEDLING:
       case SAPLING:
       case TREE:
-        return disk.readSectors (dataBlocks);
+        return disk.readBlocks (dataBlocks);
 
       case SUBDIRECTORY:
         byte[] fullBuffer = new byte[dataBlocks.size () * BLOCK_ENTRY_SIZE];
         int offset = 0;
         for (DiskAddress da : dataBlocks)
         {
-          byte[] buffer = disk.readSector (da);
+          byte[] buffer = disk.readBlock (da);
           System.arraycopy (buffer, 4, fullBuffer, offset, BLOCK_ENTRY_SIZE);
           offset += BLOCK_ENTRY_SIZE;
         }
         return fullBuffer;
 
       case GSOS_EXTENDED_FILE:
-        return disk.readSectors (dataBlocks);   // data and resource forks concatenated
+        return disk.readBlocks (dataBlocks);   // data and resource forks concatenated
 
       case PASCAL_ON_PROFILE:
-        return disk.readSectors (dataBlocks);
+        return disk.readBlocks (dataBlocks);
 
       default:
         System.out.println ("Unknown storage type in getBuffer : " + storageType);
@@ -633,7 +633,7 @@ class FileEntry extends CatalogEntry implements ProdosConstants
       List<TextBuffer> buffers, int logicalBlock)
   // ---------------------------------------------------------------------------------//
   {
-    byte[] indexBuffer = disk.readSector (indexBlock);
+    byte[] indexBuffer = disk.readBlock (indexBlock);
     for (int j = 0; j < 256; j++)
     {
       int block = HexFormatter.intValue (indexBuffer[j], indexBuffer[j + 256]);
@@ -641,7 +641,7 @@ class FileEntry extends CatalogEntry implements ProdosConstants
         addresses.add (disk.getDiskAddress (block));
       else if (addresses.size () > 0)
       {
-        byte[] tempBuffer = disk.readSectors (addresses);
+        byte[] tempBuffer = disk.readBlocks (addresses);
         buffers
             .add (new TextBuffer (tempBuffer, auxType, logicalBlock - addresses.size ()));
         addresses.clear ();
diff --git a/src/com/bytezone/diskbrowser/prodos/ProdosBitMapSector.java b/src/com/bytezone/diskbrowser/prodos/ProdosBitMapSector.java
index ea55972..7ef31eb 100755
--- a/src/com/bytezone/diskbrowser/prodos/ProdosBitMapSector.java
+++ b/src/com/bytezone/diskbrowser/prodos/ProdosBitMapSector.java
@@ -30,7 +30,7 @@ class ProdosBitMapSector extends AbstractSector
     // check range of bits for current block - so far I don't have a disk that needs
     // more than a single block
     int relativeBlock =
-        diskAddress.getBlock () - parent.getVolumeDirectoryHeader ().bitMapBlock;
+        diskAddress.getBlockNo () - parent.getVolumeDirectoryHeader ().bitMapBlock;
     int startBit = relativeBlock * 4096;
     //    int endBit = startBit + 4096;
     if (startBit >= grid.width * grid.height)
diff --git a/src/com/bytezone/diskbrowser/prodos/ProdosDisk.java b/src/com/bytezone/diskbrowser/prodos/ProdosDisk.java
index 6a61430..0928075 100755
--- a/src/com/bytezone/diskbrowser/prodos/ProdosDisk.java
+++ b/src/com/bytezone/diskbrowser/prodos/ProdosDisk.java
@@ -70,11 +70,11 @@ public class ProdosDisk extends AbstractFormattedDisk
     sectorTypesList.add (extendedKeySector);
 
     for (int block = 0; block < 2; block++)
-      if (!disk.isSectorEmpty (disk.getDiskAddress (block)))
+      if (!disk.isBlockEmpty (disk.getDiskAddress (block)))
         sectorTypes[block] = dosSector;
 
     DiskAddress da = disk.getDiskAddress (0);
-    byte[] buffer = disk.readSector (da);
+    byte[] buffer = disk.readBlock (da);
     bootSector = new BootSector (disk, buffer, "Prodos", da);
 
     DefaultMutableTreeNode root = getCatalogTreeRoot ();
@@ -86,7 +86,7 @@ public class ProdosDisk extends AbstractFormattedDisk
 
     for (DiskAddress da2 : disk)
     {
-      int blockNo = da2.getBlock ();
+      int blockNo = da2.getBlockNo ();
       if (freeBlocks.get (blockNo))
       {
         if (!stillAvailable (da2))
@@ -113,8 +113,8 @@ public class ProdosDisk extends AbstractFormattedDisk
 
     do
     {
-      byte[] sectorBuffer = disk.readSector (block);
-      if (!disk.isSectorEmpty (block))
+      byte[] sectorBuffer = disk.readBlock (block);
+      if (!disk.isBlockEmpty (block))
         sectorTypes[block] = currentSectorType;
 
       int max = disk.getBlockSize () - ProdosConstants.ENTRY_SIZE;
@@ -135,7 +135,7 @@ public class ProdosDisk extends AbstractFormattedDisk
             assert vdh.entryLength == ProdosConstants.ENTRY_SIZE;
             headerEntries.add (vdh);
             currentSectorType = catalogSector;
-            if (!disk.isSectorEmpty (block))
+            if (!disk.isBlockEmpty (block))
               sectorTypes[block] = currentSectorType;
             for (int i = 0; i < vdh.totalBitMapBlocks; i++)
               sectorTypes[vdh.bitMapBlock + i] = volumeMapSector;
@@ -147,7 +147,7 @@ public class ProdosDisk extends AbstractFormattedDisk
             localHeader = new SubDirectoryHeader (this, entry, parent);
             headerEntries.add (localHeader);
             currentSectorType = subcatalogSector;
-            if (!disk.isSectorEmpty (block))
+            if (!disk.isBlockEmpty (block))
               sectorTypes[block] = currentSectorType;
             break;
 
@@ -221,7 +221,7 @@ public class ProdosDisk extends AbstractFormattedDisk
   public static boolean checkFormat (AppleDisk disk)
   // ---------------------------------------------------------------------------------//
   {
-    byte[] buffer = disk.readSector (2);          // Prodos KEY BLOCK
+    byte[] buffer = disk.readBlock (2);          // Prodos KEY BLOCK
     if (debug)
     {
       System.out.println (HexFormatter.format (buffer));
@@ -271,11 +271,11 @@ public class ProdosDisk extends AbstractFormattedDisk
   public DataSource getFormattedSector (DiskAddress da)
   // ---------------------------------------------------------------------------------//
   {
-    if (da.getBlock () == 0)
+    if (da.getBlockNo () == 0)
       return bootSector;
 
-    byte[] buffer = disk.readSector (da);
-    SectorType type = sectorTypes[da.getBlock ()];
+    byte[] buffer = disk.readBlock (da);
+    SectorType type = sectorTypes[da.getBlockNo ()];
 
     if (type == catalogSector || type == subcatalogSector)
       return new ProdosCatalogSector (this, disk, buffer, da);
diff --git a/src/com/bytezone/diskbrowser/prodos/VolumeDirectoryHeader.java b/src/com/bytezone/diskbrowser/prodos/VolumeDirectoryHeader.java
index 8f912dc..57a1388 100755
--- a/src/com/bytezone/diskbrowser/prodos/VolumeDirectoryHeader.java
+++ b/src/com/bytezone/diskbrowser/prodos/VolumeDirectoryHeader.java
@@ -39,7 +39,7 @@ class VolumeDirectoryHeader extends DirectoryHeader
     do
     {
       dataBlocks.add (disk.getDiskAddress (block));
-      byte[] buffer = disk.readSector (block);
+      byte[] buffer = disk.readBlock (block);
       block = HexFormatter.unsignedShort (buffer, 2);
     } while (block > 0);
 
@@ -47,13 +47,13 @@ class VolumeDirectoryHeader extends DirectoryHeader
     //    int bitMapBytes = totalBlocks / 8;                  // one bit per block
     int bitMapBytes = (totalBlocks - 1) / 8 + 1;                  // one bit per block
     byte[] buffer = new byte[bitMapBytes];
-    int bitMapBlocks = (bitMapBytes - 1) / disk.getSectorsPerTrack () + 1;
+    int bitMapBlocks = (bitMapBytes - 1) / disk.getBlocksPerTrack () + 1;
     int lastBitMapBlock = bitMapBlock + bitMapBlocks - 1;
     int ptr = 0;
 
     for (block = bitMapBlock; block <= lastBitMapBlock; block++)
     {
-      byte[] temp = disk.readSector (block);
+      byte[] temp = disk.readBlock (block);
       int bytesToCopy = buffer.length - ptr;
       if (bytesToCopy > temp.length)
         bytesToCopy = temp.length;
@@ -101,7 +101,7 @@ class VolumeDirectoryHeader extends DirectoryHeader
     int block = 2;
     do
     {
-      byte[] buf = disk.readSector (block);
+      byte[] buf = disk.readBlock (block);
       blockList.add (buf);
       block = HexFormatter.intValue (buf[2], buf[3]); // next block
     } while (block > 0);
diff --git a/src/com/bytezone/diskbrowser/wizardry/Header.java b/src/com/bytezone/diskbrowser/wizardry/Header.java
index b3f352f..18e06b8 100755
--- a/src/com/bytezone/diskbrowser/wizardry/Header.java
+++ b/src/com/bytezone/diskbrowser/wizardry/Header.java
@@ -112,7 +112,7 @@ class Header
     StringBuilder text = new StringBuilder (scenarioTitle + "\n\n");
 
     int ptr = 106;
-    byte[] buffer = owner.getDisk ().readSector (da);
+    byte[] buffer = owner.getDisk ().readBlock (da);
     while (buffer[ptr] != -1)
     {
       text.append (HexFormatter.getPascalString (buffer, ptr) + "\n");
@@ -143,7 +143,7 @@ class Header
     List<DiskAddress> blocks = new ArrayList<> ();
     blocks.add (da);
 
-    byte[] buffer = owner.getDisk ().readSector (da);
+    byte[] buffer = owner.getDisk ().readBlock (da);
     String text = printChars (buffer, 0);
 
     DefaultAppleFileSource dafs = new DefaultAppleFileSource (title, text, owner);
@@ -163,7 +163,7 @@ class Header
     int level = 1;
 
     StringBuilder list = new StringBuilder ("Level " + level + ":\n");
-    byte[] buffer = owner.getDisk ().readSector (da);
+    byte[] buffer = owner.getDisk ().readBlock (da);
     String text = HexFormatter.getString (buffer, 0, 512);
     String[] spells = text.split ("\n");
     for (String s : spells)
diff --git a/src/com/bytezone/diskbrowser/wizardry/Relocator.java b/src/com/bytezone/diskbrowser/wizardry/Relocator.java
index 9086449..6c8a1a0 100644
--- a/src/com/bytezone/diskbrowser/wizardry/Relocator.java
+++ b/src/com/bytezone/diskbrowser/wizardry/Relocator.java
@@ -72,9 +72,9 @@ public class Relocator extends AbstractFile
       if (diskNo > 0)
       {
         Disk disk = dataDisks[diskNo];
-        byte[] temp = disk.readSector (diskOffsets[logicalBlock]);
+        byte[] temp = disk.readBlock (diskOffsets[logicalBlock]);
         DiskAddress da = master.getDiskAddress (logicalBlock);
-        master.writeSector (da, temp);
+        master.writeBlock (da, temp);
         //        if (da.getBlock () == 0x126)
         //          System.out.println (HexFormatter.format (buffer));
         //        if (Utility.find (temp, key1))
diff --git a/src/com/bytezone/diskbrowser/wizardry/Wizardry4BootDisk.java b/src/com/bytezone/diskbrowser/wizardry/Wizardry4BootDisk.java
index 5517c60..d3dfa54 100644
--- a/src/com/bytezone/diskbrowser/wizardry/Wizardry4BootDisk.java
+++ b/src/com/bytezone/diskbrowser/wizardry/Wizardry4BootDisk.java
@@ -356,12 +356,12 @@ public class Wizardry4BootDisk extends PascalDisk
   {
     // Wizardry IV or V boot code
     byte[] header = { 0x00, (byte) 0xEA, (byte) 0xA9, 0x60, (byte) 0x8D, 0x01, 0x08 };
-    byte[] buffer = disk.readSector (0);
+    byte[] buffer = disk.readBlock (0);
 
     if (!Utility.matches (buffer, 0, header))
       return false;
 
-    buffer = disk.readSector (1);
+    buffer = disk.readBlock (1);
     if (buffer[510] != 1 || buffer[511] != 0)       // disk #1
       return false;
 
diff --git a/src/com/bytezone/diskbrowser/wizardry/WizardryScenarioDisk.java b/src/com/bytezone/diskbrowser/wizardry/WizardryScenarioDisk.java
index 75f60b2..9c65a0c 100755
--- a/src/com/bytezone/diskbrowser/wizardry/WizardryScenarioDisk.java
+++ b/src/com/bytezone/diskbrowser/wizardry/WizardryScenarioDisk.java
@@ -135,7 +135,7 @@ public class WizardryScenarioDisk extends PascalDisk
   public static boolean isWizardryFormat (Disk disk, boolean debug)
   // ---------------------------------------------------------------------------------//
   {
-    byte[] buffer = disk.readSector (2);
+    byte[] buffer = disk.readBlock (2);
     int totalFiles = HexFormatter.intValue (buffer[16], buffer[17]);
     if (totalFiles != 3)
       return false;
@@ -196,7 +196,7 @@ public class WizardryScenarioDisk extends PascalDisk
     {
       List<DiskAddress> blocks = getTwoBlocks (sd, i, sectors);
       nodeSectors.addAll (blocks);
-      byte[] buffer = disk.readSectors (blocks);
+      byte[] buffer = disk.readBlocks (blocks);
       seq = addReward (buffer, blocks, node, seq);
     }
 
@@ -243,7 +243,7 @@ public class WizardryScenarioDisk extends PascalDisk
     {
       List<DiskAddress> blocks = getTwoBlocks (sd, i, sectors);
       nodeSectors.addAll (blocks);
-      byte[] buffer = disk.readSectors (blocks);
+      byte[] buffer = disk.readBlocks (blocks);
       addCharacters (buffer, blocks, node);
     }
 
@@ -306,7 +306,7 @@ public class WizardryScenarioDisk extends PascalDisk
     {
       List<DiskAddress> blocks = getTwoBlocks (sd, i, sectors);
       nodeSectors.addAll (blocks);
-      byte[] buffer = disk.readSectors (blocks);
+      byte[] buffer = disk.readBlocks (blocks);
       addMonsters (buffer, blocks, node);
     }
 
@@ -363,7 +363,7 @@ public class WizardryScenarioDisk extends PascalDisk
     {
       List<DiskAddress> blocks = getTwoBlocks (sd, i, sectors);
       nodeSectors.addAll (blocks);
-      byte[] buffer = disk.readSectors (blocks);
+      byte[] buffer = disk.readBlocks (blocks);
       addItems (buffer, blocks, node);
     }
 
@@ -419,7 +419,7 @@ public class WizardryScenarioDisk extends PascalDisk
     SpellType spellType = SpellType.MAGE;
     for (DiskAddress da : blocks)
     {
-      byte[] buffer = disk.readSector (da);
+      byte[] buffer = disk.readBlock (da);
       int level = 1;
       int ptr = -1;
       while (ptr < 255)
@@ -459,7 +459,7 @@ public class WizardryScenarioDisk extends PascalDisk
 
     for (DiskAddress da : sectors)
     {
-      byte[] tempBuffer = disk.readSector (da);
+      byte[] tempBuffer = disk.readBlock (da);
       System.arraycopy (tempBuffer, 0, buffer, offset, max);
       offset += max;
     }
@@ -518,7 +518,7 @@ public class WizardryScenarioDisk extends PascalDisk
     {
       List<DiskAddress> blocks = getTwoBlocks (sd, i, sectors);
       nodeSectors.addAll (blocks);
-      byte[] buffer = disk.readSectors (blocks);
+      byte[] buffer = disk.readBlocks (blocks);
       byte[] data2 = new byte[896];
       System.arraycopy (buffer, 0, data2, 0, data2.length);
       //      System.out.println (HexFormatter.format (data2));
@@ -554,7 +554,7 @@ public class WizardryScenarioDisk extends PascalDisk
     {
       DiskAddress da = sectors.get (sd.dataOffset + i);
       nodeSectors.add (da);
-      byte[] buffer = disk.readSector (da);
+      byte[] buffer = disk.readBlock (da);
       byte[] exactBuffer = new byte[480];
       System.arraycopy (buffer, 0, exactBuffer, 0, exactBuffer.length);
 
@@ -596,7 +596,7 @@ public class WizardryScenarioDisk extends PascalDisk
     {
       List<DiskAddress> blocks = getTwoBlocks (sd, i, sectors);
       nodeSectors.addAll (blocks);
-      byte[] buffer = disk.readSectors (blocks);
+      byte[] buffer = disk.readBlocks (blocks);
 
       for (int ptr = 0; ptr <= buffer.length; ptr += 78)
       {