diff --git a/src/main/java/jace/hardware/massStorage/DirectoryNode.java b/src/main/java/jace/hardware/massStorage/DirectoryNode.java
index 5de592d..6024af5 100644
--- a/src/main/java/jace/hardware/massStorage/DirectoryNode.java
+++ b/src/main/java/jace/hardware/massStorage/DirectoryNode.java
@@ -37,21 +37,23 @@ public class DirectoryNode extends DiskNode implements FileFilter {
 //    public static int FILE_ENTRY_SIZE = 38;
 
     public static int FILE_ENTRY_SIZE = 0x027;
-
-    public DirectoryNode(ProdosVirtualDisk ownerFilesystem, File physicalDir, int baseBlock) throws IOException {
-        setBaseBlock(baseBlock);
-        init(ownerFilesystem, physicalDir);
+    private boolean isRoot;
+    
+    public DirectoryNode(ProdosVirtualDisk ownerFilesystem, File physicalDir, int baseBlock, boolean root) throws IOException {
+        super(ownerFilesystem, baseBlock);
+        init(ownerFilesystem, physicalDir, root);
     }
 
-    public DirectoryNode(ProdosVirtualDisk ownerFilesystem, File physicalDir) throws IOException {
-        init(ownerFilesystem, physicalDir);
+    public DirectoryNode(ProdosVirtualDisk ownerFilesystem, File physicalDir, boolean root) throws IOException {
+        super(ownerFilesystem);
+        init(ownerFilesystem, physicalDir, root);
     }
 
-    private void init(ProdosVirtualDisk ownerFilesystem, File physicalFile) throws IOException {
+    private void init(ProdosVirtualDisk ownerFilesystem, File physicalFile, boolean root) throws IOException {
+        isRoot = root;
         setPhysicalFile(physicalFile);
         setType(EntryType.SUBDIRECTORY);
         setName(physicalFile.getName());
-        setOwnerFilesystem(ownerFilesystem);
     }
 
     @Override
@@ -59,15 +61,15 @@ public class DirectoryNode extends DiskNode implements FileFilter {
     }
 
     @Override
-    public void doAllocate() {
+    public void doAllocate() throws IOException {
         File[] files = physicalFile.listFiles(this);
         int numEntries = files.length;
-        int numBlocks = 1;
         // First block has 12 entries, subsequent blocks have 13 entries
-        if (numEntries > 12) {
-            numBlocks += (numEntries - 12) / 13;
+        int numBlocks = 1 + numEntries / 13;
+        for (int i=1; i < numBlocks; i++) {
+            new SubNode(i, this, getOwnerFilesystem().getNextFreeBlock());
         }
-
+        
         for (File f : files) {
             addFile(f);
         }
@@ -126,6 +128,7 @@ public class DirectoryNode extends DiskNode implements FileFilter {
                 generateFileEntry(buffer, 4 + (i + 1) * FILE_ENTRY_SIZE, i);
             }
         } else {
+            generatePointers(buffer, additionalNodes.get(block-1).getBaseBlock(), block < (additionalNodes.size()-1) ? additionalNodes.get(block+1).getBaseBlock() : 0);
             int start = (block * 13) - 1;
             int end = start + 13;
             int offset = 4;
@@ -150,6 +153,13 @@ public class DirectoryNode extends DiskNode implements FileFilter {
         return !file.isHidden();
     }
 
+    private void generatePointers(byte[] buffer, int prevBlock, int nextBlock) {
+        // Previous block = 0
+        generateWord(buffer, 0, prevBlock);
+        // Next block
+        generateWord(buffer, 0x02, nextBlock);        
+    }
+    
     /**
      * Generate the directory header found in the base block of a directory
      *
@@ -157,21 +167,17 @@ public class DirectoryNode extends DiskNode implements FileFilter {
      */
     @SuppressWarnings("static-access")
     private void generateHeader(byte[] buffer) {
-        // Previous block = 0
-        generateWord(buffer, 0, 0);
-        // Next block
-        int nextBlock = 0;
-        if (!additionalNodes.isEmpty()) {
-            nextBlock = additionalNodes.get(0).baseBlock;
-        }
-        generateWord(buffer, 0x02, nextBlock);
+        generatePointers(buffer, 0, additionalNodes.size()>1 ? additionalNodes.get(1).getBaseBlock() : 0);
         // Directory header + name length
         // Volumme header = 0x0f0; Subdirectory header = 0x0e0
-        buffer[4] = (byte) ((baseBlock == 0x02 ? 0x0f0 : 0x0E0) + getName().length());
+        buffer[4] = (byte) ((isRoot ? 0x0F0 : 0x0E0) | getName().length());
         generateName(buffer, 5, this);
         for (int i = 0x014; i <= 0x01b; i++) {
             buffer[i] = 0;
         }
+        if (!isRoot) {
+            buffer[0x014] = 0x075;
+        }
         generateTimestamp(buffer, 0x01c, getPhysicalFile().lastModified());
         // Prodos 1.9
         buffer[0x020] = 0x019;
@@ -185,10 +191,17 @@ public class DirectoryNode extends DiskNode implements FileFilter {
         buffer[0x024] = (byte) 0x0d;
         // Directory items count
         generateWord(buffer, 0x025, children.size());
-        // Volume bitmap pointer
-        generateWord(buffer, 0x027, ownerFilesystem.freespaceBitmap.baseBlock);
-        // Total number of blocks
-        generateWord(buffer, 0x029, ownerFilesystem.MAX_BLOCK);
+        if (isRoot) {
+            // Volume bitmap pointer
+            generateWord(buffer, 0x027, ownerFilesystem.freespaceBitmap.getBaseBlock());
+            // Total number of blocks
+            generateWord(buffer, 0x029, ownerFilesystem.MAX_BLOCK);
+        } else {
+            // Parent pointer
+            generateWord(buffer, 0x027, getParent().getBaseBlock());
+            buffer[0x029] = (byte) (getParent().getChildren().indexOf(this) + 1);
+            buffer[0x02a] = 0x027;
+        }
     }
 
     /**
@@ -200,7 +213,6 @@ public class DirectoryNode extends DiskNode implements FileFilter {
      */
     private void generateFileEntry(byte[] buffer, int offset, int fileNumber) throws IOException {
         DiskNode child = children.get(fileNumber);
-        child.allocate();
         // Entry Type and length
         buffer[offset] = (byte) ((child.getType().code << 4) + child.getName().length());
         // Name
@@ -261,7 +273,7 @@ public class DirectoryNode extends DiskNode implements FileFilter {
     private void addFile(File file) {
         try {
             if (file.isDirectory()) {
-                addChild(new DirectoryNode(getOwnerFilesystem(), file));
+                addChild(new DirectoryNode(getOwnerFilesystem(), file, false));
             } else {
                 addChild(new FileNode(getOwnerFilesystem(), file));
             }
diff --git a/src/main/java/jace/hardware/massStorage/DiskNode.java b/src/main/java/jace/hardware/massStorage/DiskNode.java
index e005482..e44b839 100644
--- a/src/main/java/jace/hardware/massStorage/DiskNode.java
+++ b/src/main/java/jace/hardware/massStorage/DiskNode.java
@@ -33,7 +33,6 @@ import java.util.List;
 public abstract class DiskNode {
 
     public enum EntryType {
-
         DELETED(0),
         SEEDLING(1),
         SAPLING(2),
@@ -50,7 +49,7 @@ public abstract class DiskNode {
     boolean allocated = false;
     long allocationTime = -1L;
     long lastCheckTime = -1L;
-    int baseBlock = -1;
+    private int baseBlock = -1;
     List<DiskNode> additionalNodes;
     ProdosVirtualDisk ownerFilesystem;
     File physicalFile;
@@ -59,13 +58,23 @@ public abstract class DiskNode {
     private EntryType type;
     private String name;
 
-    public DiskNode() {
+    public DiskNode(ProdosVirtualDisk fs) throws IOException {
+        init(fs);
+        setBaseBlock(fs.getNextFreeBlock());
+    }
+
+    public DiskNode(ProdosVirtualDisk fs, int blockNumber) throws IOException {
+        init(fs);
+        setBaseBlock(blockNumber);
+    }
+    
+    private void init(ProdosVirtualDisk fs) throws IOException {
         additionalNodes = new ArrayList<>();
         children = new ArrayList<>();
+        setOwnerFilesystem(fs);
     }
 
     public boolean checkFile() throws IOException {
-        allocate();
         if (physicalFile == null) {
             return false;
         }
@@ -80,9 +89,9 @@ public abstract class DiskNode {
     public void allocate() throws IOException {
         if (!allocated) {
             doAllocate();
+            getOwnerFilesystem().physicalMap.put(baseBlock, this);
             allocationTime = System.currentTimeMillis();
             allocated = true;
-            ownerFilesystem.allocateEntry(this);
         }
     }
 
@@ -101,11 +110,9 @@ public abstract class DiskNode {
     }
 
     public void refresh() throws IOException {
-        ownerFilesystem.deallocateEntry(this);
+        deallocate();
         doRefresh();
-        allocationTime = System.currentTimeMillis();
-        allocated = true;
-        ownerFilesystem.allocateEntry(this);
+        allocate();        
     }
 
     /**
@@ -139,8 +146,9 @@ public abstract class DiskNode {
     /**
      * @param baseBlock the baseBlock to set
      */
-    public void setBaseBlock(int baseBlock) {
+    private void setBaseBlock(int baseBlock) {
         this.baseBlock = baseBlock;
+        ownerFilesystem.physicalMap.put(baseBlock, this);
     }
 
     /**
@@ -154,12 +162,8 @@ public abstract class DiskNode {
      * @param ownerFilesystem the ownerFilesystem to set
      * @throws IOException
      */
-    public void setOwnerFilesystem(ProdosVirtualDisk ownerFilesystem) throws IOException {
+    private void setOwnerFilesystem(ProdosVirtualDisk ownerFilesystem) throws IOException {
         this.ownerFilesystem = ownerFilesystem;
-        if (baseBlock == -1) {
-            setBaseBlock(ownerFilesystem.getNextFreeBlock());
-        }
-        ownerFilesystem.allocateEntry(this);
     }
 
     /**
@@ -206,6 +210,7 @@ public abstract class DiskNode {
     }
 
     public void addChild(DiskNode child) {
+        child.setParent(this);
         children.add(child);
     }
 
diff --git a/src/main/java/jace/hardware/massStorage/FileNode.java b/src/main/java/jace/hardware/massStorage/FileNode.java
index 8c9158f..d6893f2 100644
--- a/src/main/java/jace/hardware/massStorage/FileNode.java
+++ b/src/main/java/jace/hardware/massStorage/FileNode.java
@@ -125,7 +125,7 @@ public class FileNode extends DiskNode {
     }
 
     public FileNode(ProdosVirtualDisk ownerFilesystem, File file) throws IOException {
-        setOwnerFilesystem(ownerFilesystem);
+        super(ownerFilesystem);
         setPhysicalFile(file);
         setName(file.getName());
     }
@@ -141,10 +141,9 @@ public class FileNode extends DiskNode {
         if (treeBlocks > 1) {
             treeBlocks++;
         }
-        for (int i = 0; i < dataBlocks + treeBlocks; i++) {
+        for (int i = 1; i < dataBlocks + treeBlocks; i++) {
             new SubNode(i, this);
         }
-        setBaseBlock(additionalNodes.get(0).getBaseBlock());
     }
 
     @Override
@@ -153,6 +152,7 @@ public class FileNode extends DiskNode {
 
     @Override
     public void readBlock(int block, byte[] buffer) throws IOException {
+        allocate();
         int dataBlocks = (int) ((getPhysicalFile().length() + ProdosVirtualDisk.BLOCK_SIZE - 1) / ProdosVirtualDisk.BLOCK_SIZE);
         int treeBlocks = (((dataBlocks * 2) + (ProdosVirtualDisk.BLOCK_SIZE - 2)) / ProdosVirtualDisk.BLOCK_SIZE);
         if (treeBlocks > 1) {
@@ -167,7 +167,7 @@ public class FileNode extends DiskNode {
                     readFile(buffer, (block - 1));
                 } else {
                     // Generate seedling index block
-                    generateIndex(buffer, 1, treeBlocks + dataBlocks);
+                    generateIndex(buffer, 1, dataBlocks+1);
                 }
                 break;
             case TREE:
@@ -193,8 +193,8 @@ public class FileNode extends DiskNode {
 
     private void generateIndex(byte[] buffer, int indexStart, int indexLimit) {
         Arrays.fill(buffer, (byte) 0);
-        for (int i = indexStart, count = 0; count < 256 && i < indexLimit && i < additionalNodes.size(); i++, count++) {
-            int base = additionalNodes.get(i).baseBlock;
+        for (int i = indexStart, count = 0; count < 256 && i < indexLimit && i <= additionalNodes.size(); i++, count++) {
+            int base = additionalNodes.get(i-1).getBaseBlock();
             buffer[count] = (byte) (base & 0x0ff);
             buffer[count + 256] = (byte) (base >> 8);
         }
diff --git a/src/main/java/jace/hardware/massStorage/FreespaceBitmap.java b/src/main/java/jace/hardware/massStorage/FreespaceBitmap.java
index 0b3dee2..e09cf4c 100644
--- a/src/main/java/jace/hardware/massStorage/FreespaceBitmap.java
+++ b/src/main/java/jace/hardware/massStorage/FreespaceBitmap.java
@@ -27,8 +27,7 @@ import java.io.IOException;
 public class FreespaceBitmap extends DiskNode {
     int size = (ProdosVirtualDisk.MAX_BLOCK + 1) / 8 / ProdosVirtualDisk.BLOCK_SIZE;
     public FreespaceBitmap(ProdosVirtualDisk fs, int start) throws IOException {
-        setBaseBlock(start);
-        setOwnerFilesystem(fs);
+        super(fs, start);
 
         for (int i=1; i < size; i++) {
             SubNode subNode = new SubNode(i, this, start+i);
diff --git a/src/main/java/jace/hardware/massStorage/ProdosVirtualDisk.java b/src/main/java/jace/hardware/massStorage/ProdosVirtualDisk.java
index 7f4d566..34cddb9 100644
--- a/src/main/java/jace/hardware/massStorage/ProdosVirtualDisk.java
+++ b/src/main/java/jace/hardware/massStorage/ProdosVirtualDisk.java
@@ -52,6 +52,7 @@ public class ProdosVirtualDisk implements IDisk {
 
     public ProdosVirtualDisk(File rootPath) throws IOException {
         ioBuffer = new byte[BLOCK_SIZE];
+        initDiskStructure();
         setPhysicalPath(rootPath);
     }
 
@@ -131,25 +132,14 @@ public class ProdosVirtualDisk implements IDisk {
         throw new IOException("Virtual Disk Full!");
     }
 
-    // Mark space occupied by node
-    public void allocateEntry(DiskNode node) throws IOException {
-        physicalMap.put(node.baseBlock, node);
-
-        for (DiskNode subnode : node.additionalNodes) {
-            int blockNum = getNextFreeBlock();
-            subnode.setBaseBlock(blockNum);
-            physicalMap.put(blockNum, subnode);
-        }
-    }
-
     // Mark space occupied by nodes as free (remove allocation mapping)
     public void deallocateEntry(DiskNode node) {
         // Only de-map nodes if the allocation table is actually pointing to the nodes!
-        if (physicalMap.get(node.baseBlock) != null && physicalMap.get(node.baseBlock).equals(node)) {
-            physicalMap.remove(node.baseBlock);
+        if (physicalMap.get(node.getBaseBlock()) != null && physicalMap.get(node.getBaseBlock()).equals(node)) {
+            physicalMap.remove(node.getBaseBlock());
         }
         node.additionalNodes.stream().filter((sub)
-                -> (physicalMap.get(sub.getBaseBlock()) != null && physicalMap.get(sub.baseBlock).equals(sub))).
+                -> (physicalMap.get(sub.getBaseBlock()) != null && physicalMap.get(sub.getBaseBlock()).equals(sub))).
                 forEach((sub) -> {
                     physicalMap.remove(sub.getBaseBlock());
                 });
@@ -183,12 +173,16 @@ public class ProdosVirtualDisk implements IDisk {
         return physicalRoot;
     }
 
-    public void setPhysicalPath(File f) throws IOException {
+    private void initDiskStructure() throws IOException {
+        physicalMap = new HashMap<>();
+        freespaceBitmap = new FreespaceBitmap(this, FREESPACE_BITMAP_START);
+    }
+    
+    private void setPhysicalPath(File f) throws IOException {
         if (physicalRoot != null && physicalRoot.equals(f)) {
             return;
         }
         physicalRoot = f;
-        physicalMap = new HashMap<>();
         if (!physicalRoot.exists() || !physicalRoot.isDirectory()) {
             try {
                 throw new IOException("Root path must be a directory that exists!");
@@ -197,12 +191,9 @@ public class ProdosVirtualDisk implements IDisk {
             }
         }
         // Root directory ALWAYS starts on block 2!
-        rootDirectory = new DirectoryNode(this, physicalRoot, VOLUME_START);
+        rootDirectory = new DirectoryNode(this, physicalRoot, VOLUME_START, true);
         rootDirectory.setName("VIRTUAL");
-        allocateEntry(rootDirectory);
-        freespaceBitmap = new FreespaceBitmap(this, FREESPACE_BITMAP_START);
-        allocateEntry(freespaceBitmap);
-
+        rootDirectory.allocate();
     }
 
     @Override
diff --git a/src/main/java/jace/hardware/massStorage/SubNode.java b/src/main/java/jace/hardware/massStorage/SubNode.java
index 200bff0..d832d8b 100644
--- a/src/main/java/jace/hardware/massStorage/SubNode.java
+++ b/src/main/java/jace/hardware/massStorage/SubNode.java
@@ -33,18 +33,18 @@ public class SubNode extends DiskNode {
     int sequenceNumber;
 
     public SubNode(int seq, DiskNode parent) throws IOException {
+        super(parent.getOwnerFilesystem());
         init(seq, parent);
     }
 
     public SubNode(int seq, DiskNode parent, int baseBlock) throws IOException {
-        setBaseBlock(baseBlock);
+        super(parent.getOwnerFilesystem(), baseBlock);
         init(seq, parent);
     }
 
     private void init(int seq, DiskNode parent) throws IOException {
         sequenceNumber = seq;
         setParent(parent);
-        setOwnerFilesystem(parent.getOwnerFilesystem());
         parent.additionalNodes.add(this);
     }