Fix Invalid MS-DOS Function error on Windows 11/10

The users of Windows 11/10 have at times witnessed the issue of Invalid MS-DOS Function error. This may be a result of several reasons such as damaged files, corrupted system, etc. This error forbids the users from transferring files on their PC. Hence, this blog will delve into the solutions to fix the issue of invalid MS-DOS Function error on Windows 11/10.

Fix Invalid MS-DOS Function error on Windows 11/10

There are various solutions which the users can try to solve the issue of invalid MS-DOS Function error on Windows 11/10. Thus, now let us look into all the solutions in detail.

Fix 1: Running SFC Scan

Running a system file scan can help the users in solving the aforementioned issue easily. Therefore, follow the steps given below to run the SFC Scan and solve the issue.

Step 1- At first, open Command Prompt and run it as an administrator.

Step 2- Next, copy and paste the prompt given below and select Enter.

sfc /scannow

Step 3- Lastly, after the completion of the scan, exit the Command Prompt and reboot the PC.

Fix 2: Running CHKDSK

The CHKDSK command also aids in solving the problem of invalid MS-DOS Function error on Windows 11/10. Thus, check the steps below to run CHKDSK.

Step 1- Firstly, run Command Prompt as an administrator.

Step 2- Next copy and paste the command given below and select Enter.

chkdsk /x /f /r

Step 3- Now, the message of ‘Chkdsk cannot run because the volume is in use by another process. Would you like to schedule this volume to be checked the next time the system restarts? (Y/N)’ will appear on the screen.

Step 4- Lastly, type Y on keyboard and restart the PC.

Fix 3: Optimizing and defragging Drive

For optimizing and defragging the hard drive on the PC, follow the instructions given below.

Step 1- Primarily, open This PC. Next right-click on a drive.

Step 2- Now, select Properties > Tools > Optimise > Optimise. This will show the status of the drives.

Step 3- Finally for fixing the issue of invalid MS-DOS Function, restart the PC.

Fix 4: Booting in Safe Mode

Another solution is booting the the PC in Safe Mode which will remove any kind of bug existing in the PC. The steps for doing the same are provided below.

Step 1- Firstly, open the Start Menu and press the power icon.

Step 2- Next, hold the Shift button and press Restart.

Step 3- Now, select Troubleshoot > Advanced Options > Startup Settings.

Step 4- Again, select Restart and click 4 on keyboard. This will enter the PC in Safe Mode.

Fix 5: Editing System Policy in Registry Editor

Altering the system policy in Registry Editor can also help the users of Windows to solve the mentioned issue. Therefore, check the instructions below for doing the same.

Step 1- Firstly, type Windows + R and open Run dialog box. Next, write regedit and click Enter. It will open the Registry editor.

Step 2- Now, copy and paste the path given below and press Enter.

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System

Step 3- Now, right-click on the empty space on the right pane. Then, navigate to New > DWORD (32-Bit) Value.

Step 4- Further, change the value name to CopyFileBufferedSynchronousIo and click Enter button.

Step 5- Again, double-click the new value and open it. Thereafter, write 1 in the value box press Enter for saving all the changes.

Step 6- Finally, restart the PC and see if the issue has solved.

Fix 6: Formatting the Destination Drive

The destination drive having an incompatible format can also lead to the occurrence of the error of invalid MS-DOS function. Hence, formatting the destination drive to its source drive can aid in solving this issue. However, if the destination drive has files in it then ensure to back up it first before formatting it.

Hoping that all these fixes will help in solving the issue.