diff --git a/lib/TerranVirtualDisk-src.jar b/lib/TerranVirtualDisk-src.jar
new file mode 100644
index 0000000..962c2af
Binary files /dev/null and b/lib/TerranVirtualDisk-src.jar differ
diff --git a/lib/TerranVirtualDisk.jar b/lib/TerranVirtualDisk.jar
index b6af461..edb7db7 100644
Binary files a/lib/TerranVirtualDisk.jar and b/lib/TerranVirtualDisk.jar differ
diff --git a/tsvm_core/src/net/torvald/tsvm/peripheral/TestDiskDrive.kt b/tsvm_core/src/net/torvald/tsvm/peripheral/TestDiskDrive.kt
index ead434b..a00ff39 100644
--- a/tsvm_core/src/net/torvald/tsvm/peripheral/TestDiskDrive.kt
+++ b/tsvm_core/src/net/torvald/tsvm/peripheral/TestDiskDrive.kt
@@ -63,7 +63,7 @@ class TestDiskDrive(private val vm: VM, private val driveNum: Int, theRootPath:
         if (DBGPRN) println("[TestDiskDrive] $msg")
     }
 
-    private val rootPath = File(theRootPath) ?: File("test_assets/test_drive_$driveNum")
+    private val rootPath = File(theRootPath)
 
     private var fileOpen = false
     private var fileOpenMode = -1 // 1: 'W", 2: 'A'
diff --git a/tsvm_core/src/net/torvald/tsvm/peripheral/TevdDiskDrive.kt b/tsvm_core/src/net/torvald/tsvm/peripheral/TevdDiskDrive.kt
new file mode 100644
index 0000000..ca6d8bc
--- /dev/null
+++ b/tsvm_core/src/net/torvald/tsvm/peripheral/TevdDiskDrive.kt
@@ -0,0 +1,99 @@
+package net.torvald.tsvm.peripheral
+
+import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.VDUtil
+import net.torvald.tsvm.VM
+import java.io.ByteArrayOutputStream
+import java.io.File
+import java.io.FileNotFoundException
+
+/**
+ * Created by minjaesong on 2022-12-15.
+ */
+class TevdDiskDrive(private val vm: VM, private val theRootPath: String) : BlockTransferInterface(false, true) {
+
+
+    private val DBGPRN = true
+
+
+    private fun printdbg(msg: Any) {
+        if (DBGPRN) println("[TestDiskDrive] $msg")
+    }
+
+    private val rootPath = File(theRootPath)
+
+    private var fileOpen = false
+    private var fileOpenMode = -1 // 1: 'W", 2: 'A'
+    private var file = File(rootPath.toURI())
+    //private var readModeLength = -1 // always 4096
+    private var writeMode = false
+    private var appendMode = false
+    private var writeModeLength = -1
+
+    private val messageComposeBuffer = ByteArrayOutputStream(BLOCK_SIZE) // always use this and don't alter blockSendBuffer please
+    private var blockSendBuffer = ByteArray(1)
+    private var blockSendCount = 0
+
+
+    init {
+        statusCode = TestDiskDrive.STATE_CODE_STANDBY
+
+        if (!rootPath.exists()) {
+            throw FileNotFoundException("Disk file '${theRootPath}' not found")
+        }
+    }
+
+    private val DOM = VDUtil.readDiskArchive(rootPath, charset = VM.CHARSET)
+
+    companion object {
+        /** How often the changes in DOM (disk object model) should be saved to the physical drive when there are changes. Seconds. */
+        const val COMMIT_INTERVAL = 30
+    }
+
+    fun commit() {
+        VDUtil.dumpToRealMachine(DOM, rootPath)
+    }
+
+
+    private fun resetBuf() {
+        blockSendCount = 0
+        messageComposeBuffer.reset()
+    }
+
+
+    override fun hasNext(): Boolean {
+
+
+        return (blockSendCount * BLOCK_SIZE < blockSendBuffer.size)
+    }
+
+    /** Computer's attempt to startRead() will result in calling this very function.
+     *
+     * Disk drive must send prepared message (or file transfer packet) to the computer.
+     */
+    override fun startSendImpl(recipient: BlockTransferInterface): Int {
+        if (blockSendCount == 0) {
+            blockSendBuffer = messageComposeBuffer.toByteArray()
+        }
+
+        val sendSize = if (blockSendBuffer.size - (blockSendCount * BLOCK_SIZE) < BLOCK_SIZE)
+            blockSendBuffer.size % BLOCK_SIZE
+        else BLOCK_SIZE
+
+        recipient.writeout(ByteArray(sendSize) {
+            blockSendBuffer[blockSendCount * BLOCK_SIZE + it]
+        })
+
+        blockSendCount += 1
+
+        return sendSize
+    }
+
+    private lateinit var writeBuffer: ByteArray
+    private var writeBufferUsage = 0
+
+    override fun writeoutImpl(inputData: ByteArray) {
+        TODO("Not yet implemented")
+    }
+
+
+}
\ No newline at end of file