diff --git a/lib/TerranVirtualDisk-src.jar b/lib/TerranVirtualDisk-src.jar
index 26a7087..9b335a4 100644
Binary files a/lib/TerranVirtualDisk-src.jar and b/lib/TerranVirtualDisk-src.jar differ
diff --git a/lib/TerranVirtualDisk.jar b/lib/TerranVirtualDisk.jar
index 81c26a7..7f047ca 100644
Binary files a/lib/TerranVirtualDisk.jar and b/lib/TerranVirtualDisk.jar differ
diff --git a/tsvm_core/src/net/torvald/tsvm/VMWatchdog.kt b/tsvm_core/src/net/torvald/tsvm/VMWatchdog.kt
index dccad6f..ce6bd1d 100644
--- a/tsvm_core/src/net/torvald/tsvm/VMWatchdog.kt
+++ b/tsvm_core/src/net/torvald/tsvm/VMWatchdog.kt
@@ -18,7 +18,7 @@ abstract class VMWatchdog {
         akku += delta
         while (akku > interval) {
             consumeMessages()
-            println("[${this.javaClass.simpleName}] boop!")
+//            println("[${this.javaClass.simpleName}] boop!")
             akku -= interval
         }
     }
@@ -38,7 +38,7 @@ object TevdSyncWatchdog : VMWatchdog() {
         synchronized(this) {
             messageQueue.forEach { (outfile, dom) ->
                 VDUtil.dumpToRealMachine(dom, outfile)
-                println("[${this.javaClass.simpleName}] dump ${outfile.path}")
+//                println("[${this.javaClass.simpleName}] dump ${outfile.path}")
             }
             messageQueue.clear()
         }
diff --git a/tsvm_core/src/net/torvald/tsvm/peripheral/TevdDiskDrive.kt b/tsvm_core/src/net/torvald/tsvm/peripheral/TevdDiskDrive.kt
index c223da6..a73c2d1 100644
--- a/tsvm_core/src/net/torvald/tsvm/peripheral/TevdDiskDrive.kt
+++ b/tsvm_core/src/net/torvald/tsvm/peripheral/TevdDiskDrive.kt
@@ -14,7 +14,7 @@ import java.util.concurrent.atomic.AtomicBoolean
 class TevdDiskDrive(private val vm: VM, private val driveNum: Int, private val theTevdPath: String, val diskUUIDstr: String) : BlockTransferInterface(false, true) {
 
 
-    private val DBGPRN = true
+    private val DBGPRN = false
 
     val diskID: UUID = UUID.fromString(diskUUIDstr)
 
@@ -95,7 +95,7 @@ class TevdDiskDrive(private val vm: VM, private val driveNum: Int, private val t
      * Disk drive must create desired side effects in accordance with the input message.
      */
     override fun writeoutImpl(inputData: ByteArray) {
-        println("[TevDiskDrive] inputString=${inputData.trimNull().toString(VM.CHARSET)}")
+        printdbg("inputString=${inputData.trimNull().toString(VM.CHARSET)}")
 
         if (writeMode || appendMode) {
             //println("[DiskDrive] writeout with inputdata length of ${inputData.size}")
@@ -305,23 +305,23 @@ class TevdDiskDrive(private val vm: VM, private val driveNum: Int, private val t
 
                 val bootFile = TevdFileDescriptor(DOM, "!BOOTSEC")
 
-                println("bootFile = $bootFile, ID: ${bootFile.entryID}, exists = ${bootFile.exists()}")
+                printdbg("bootFile = $bootFile, ID: ${bootFile.entryID}, exists = ${bootFile.exists()}")
 
                 if (!bootFile.exists()) {
-                    println("bootfile not exists!")
+                    printdbg("bootfile not exists!")
                     statusCode.set(TestDiskDrive.STATE_CODE_NO_SUCH_FILE_EXISTS)
                     return
                 }
                 try {
                     val retMsg = bootFile.getHeadBytes(BLOCK_SIZE)
 
-                    println("retMsg = ${retMsg.toString(VM.CHARSET)}")
+                    printdbg("retMsg = ${retMsg.toString(VM.CHARSET)}")
 
                     recipient?.writeout(retMsg)
                     statusCode.set(TestDiskDrive.STATE_CODE_STANDBY)
                 }
                 catch (e: IOException) {
-                    println("exception:")
+                    printdbg("exception:")
                     e.printStackTrace()
 
                     statusCode.set(TestDiskDrive.STATE_CODE_SYSTEM_IO_ERROR)
diff --git a/tsvm_core/src/net/torvald/tsvm/peripheral/TevdFileDescriptor.kt b/tsvm_core/src/net/torvald/tsvm/peripheral/TevdFileDescriptor.kt
index 6f0dcb1..33d0b6c 100644
--- a/tsvm_core/src/net/torvald/tsvm/peripheral/TevdFileDescriptor.kt
+++ b/tsvm_core/src/net/torvald/tsvm/peripheral/TevdFileDescriptor.kt
@@ -35,14 +35,17 @@ class TevdFileDescriptor(val DOM: VirtualDisk, _pathstr: String) {
         get() = entryID.let { if (it == null) false else VDUtil.isDirectoryFollowSymlink(DOM, it) }
 
 
-    private var fileContent: EntryFile? = null
-
     fun appendBytes(bytes: ByteArray) {
-        fileContent?.getContent()?.appendBytes(bytes)
+        val fileContent = VDUtil.getAsNormalFile(DOM, vdPath) // this is not an object properties: the reference to the file may have been changed
+        fileContent.getContent().appendBytes(bytes)
     }
 
     fun writeBytes(bytes: ByteArray) {
-        fileContent?.replaceContent(ByteArray64.fromByteArray(bytes))
+        val fileContent = VDUtil.getAsNormalFile(DOM, vdPath)
+//        println("[TevdFileDesc] ${path} writing ${bytes.size} bytes...")
+//        println("Old: ${fileContent.getContent().toByteArray().toString(VM.CHARSET)}")
+        fileContent.replaceContent(ByteArray64.fromByteArray(bytes))
+//        println("New: ${fileContent.getContent().toByteArray().toString(VM.CHARSET)}")
     }
 
     /**
@@ -53,9 +56,9 @@ class TevdFileDescriptor(val DOM: VirtualDisk, _pathstr: String) {
         if (isDirectory) throw RuntimeException("Not a file")
         if (!exists()) throw IOException("File not found")
 
-        if (fileContent == null) fileContent = VDUtil.getAsNormalFile(DOM, vdPath)
+        val fileContent = VDUtil.getAsNormalFile(DOM, vdPath)
 
-        return fileContent!!.getContent().let {
+        return fileContent.getContent().let {
             it.sliceArray64(0L until minOf(length, it.size))
         }
     }
@@ -67,9 +70,9 @@ class TevdFileDescriptor(val DOM: VirtualDisk, _pathstr: String) {
         if (isDirectory) throw RuntimeException("Not a file")
         if (!exists()) throw IOException("File not found")
 
-        if (fileContent == null) fileContent = VDUtil.getAsNormalFile(DOM, vdPath)
+        val fileContent = VDUtil.getAsNormalFile(DOM, vdPath)
 
-        return fileContent!!.getContent().let {
+        return fileContent.getContent().let {
             it.sliceArray(0 until minOf(length.toLong(), it.size).toInt())
         }
     }
@@ -79,12 +82,11 @@ class TevdFileDescriptor(val DOM: VirtualDisk, _pathstr: String) {
     }
 
     fun delete() {
-        fileContent = null
         VDUtil.deleteFile(DOM, vdPath)
     }
 
     fun length(): Long {
-        return if (isFile) fileContent?.getSizePure() ?: 0L
+        return if (isFile) VDUtil.getAsNormalFileOrNull(DOM, vdPath)?.getSizePure() ?: 0L
         else -1L
     }
 
@@ -117,9 +119,9 @@ class TevdFileDescriptor(val DOM: VirtualDisk, _pathstr: String) {
     }
 
     fun createNewFile(): Boolean {
-        fileContent = EntryFile(ByteArray64())
+        val fileContent = EntryFile(ByteArray64())
         val time_t = System.currentTimeMillis() / 1000
-        val newFile = DiskEntry(-1, -1, nameBytes, time_t, time_t, fileContent!!)
+        val newFile = DiskEntry(-1, -1, nameBytes, time_t, time_t, fileContent)
         return try {
             VDUtil.addFile(DOM, vdPath.getParent(), newFile)
             true