Home » Invalid MS-DOS Function Error in Windows 10 [SOLVED]

Invalid MS-DOS Function Error in Windows 10 [SOLVED]

Fix Invalid MS-DOS function error in Windows 10: If you are facing the Invalid MS-DOS function error while trying to move, copy, delete, or rename files or folders then you are at the right place as today we are going to discuss on how to resolve the issue. The error doesn’t even let copy files from one folder to another and even if you try to delete some old pictures, chances are you will face the same error message. The files doesn’t have a read-only attribute or hidden and security settings are same, so the issue is quite mysterious itself for a normal Windows users.

Fix Invalid MS-DOS function error in Windows 10

Sometimes it may be possible that the file may be altogether corrupted and that’s why the error is shown. Also, you will face the same error if you will try to copy files from NTFS file system to FAT 32 and in that case you need to follow this article. Now if the all of the above is not true for you then you can follow the below guide to Fix Invalid MS-DOS function error in Windows 10.

Invalid MS-DOS Function Error in Windows 10 [SOLVED]

Make sure to create a restore point just in case something goes wrong.

Method 1: Defragment and Optimize Drives

1.Open Control Panel then click on System and Security.

Click Find and fix problems under System and Security

2.From System and Security click on Administrative Tools.

Type Administrative in the Control Panel search and select Administrative Tools.

3.Click on Defragment and Optimize Drives in order to run it.

From Administrative Tools select Defragment and Optimize Drives

4.Select your drives one by one and click on Analyze followed by Optimize.

Select your drives one by one and click on Analyze followed by Optimize

5.Let the process run as it’s going to take some time.

6.Reboot your PC to save changes and see if you’re able to Fix Invalid MS-DOS function error in Windows 10.

Method 2: Registry Fix

Backup your registry before continuing.

1.Press Windows Key + R then type regedit and hit Enter.

Run command regedit

2.Navigate to the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System

3.Right-click on System then select New > DWORD (32-bit) value.

Right-click on system then select New and choose DWORD (32 bit) value

4.Name this DWORD as CopyFileBufferedSynchronousIo and double click on it to change it’s value to 1.

Name this DWORD as CopyFileBufferedSynchronousIo and double click on it to change it's value to 1

5.Exit registry and reboot your PC to save changes. Again see if you’re able to Fix Invalid MS-DOS function error in Windows 10 or not, if not then continue with the next method.

Method 3: Run CHKDSK

1.Press Windows Key + X then select Command Prompt (Admin).

command prompt admin

2.Type the following command in cmd and hit Enter:

chkdsk C: /f /r /x

run check disk chkdsk C: /f /r /x

Note: Make sure you use the drive letter where Windows is currently installed. Also in the above command C: is the drive on which we want to run check disk, /f stands for a flag which chkdsk the permission to fix any errors associated with the drive, /r let chkdsk search for bad sectors and perform recovery and /x instructs the check disk to dismount the drive before beginning the process.

3.Next, run CHKDSK from here Fix File System Errors with Check Disk Utility(CHKDSK).

4.Reboot your PC to save changes.

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That’s it, you have successfully Fix Invalid MS-DOS function error in Windows 10 but if you still have any queries regarding this guide then feel free to ask them in the comment’s section.

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Aditya Farrad

Aditya is a self-motivated information technology professional and has been a technology writer for the last 7 years. He covers Internet services, mobile, Windows, software, and How-to guides.

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