diff --git a/src/BlueSCSI.cpp b/src/BlueSCSI.cpp
index e18173b..de7699a 100644
--- a/src/BlueSCSI.cpp
+++ b/src/BlueSCSI.cpp
@@ -563,32 +563,38 @@ void findDriveImages(FsFile root) {
       break;
     }
 
-    // Valid file, open for reading/writing.
-    file = new FsFile(SD.open(name, O_RDWR));
-    if(file && file->isFile()) {
-      SCSI_DEVICE_TYPE device_type;
-      if(tolower(name[1]) != 'd') {
-        file->close();
-        delete file;
-        LOG_FILE.print("Not an image: ");
-        LOG_FILE.println(name);
-        continue;
-      }
-      
-      switch (tolower(name[0])) {
-      case 'h': device_type = SCSI_DEVICE_HDD;
-      break;
-      case 'c': device_type = SCSI_DEVICE_OPTICAL;
-      break;
+    if(tolower(name[1]) != 'd')
+    {
+      file->close();
+      delete file;
+      LOG_FILE.print("Not an image: ");
+      LOG_FILE.println(name);
+      continue;
+    }
+
+    SCSI_DEVICE_TYPE device_type;
+    switch (tolower(name[0]))
+    {
+      case 'h':
+        device_type = SCSI_DEVICE_HDD;
+        file = new FsFile(SD.open(name, O_RDWR));
+        break;
+      case 'c':
+        device_type = SCSI_DEVICE_OPTICAL;
+        file = new FsFile(SD.open(name, O_RDONLY));
+        break;
       default:
         file->close();
         delete file;
         LOG_FILE.print("Not an image: ");
         LOG_FILE.println(name);
         continue;
-      }
+    }
 
-      // Defaults for Hard Disks
+    // Valid file
+    if(file && file->isFile())
+    {
+      // Defaults drives
       int id  = 1; // 0 and 3 are common in Macs for physical HD and CD, so avoid them.
       int lun = 0;
       int blk = 512;