Guide to fix invalid ms-dos function error when copying files

Sometimes while you are working with some application or simply if you are accessing the files in your computer and try to copy or move some of the files from one place to other then you may get “Invalid ms-dos function error when copying files”. This is a very annoying situation as you cannot be able to copy the files very easily now. You will have to fix this problem to copy the file. So you have to fix this problem with some manual steps or you can also use Advanced System Repair for automatic solution of the error issue.


Compatible with the Windows 8 32-bit and 64-bit Operating System, Windows 7 32-bit and 64-bit Operating System, Windows Vista 32-bit and 64-bit, Windows XP 32-bit
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What are the symptoms –

Main symptom is the prompting of “Invalid ms-dos function error when copying files” on your screen while you try to copy, move or delete the files in your computer. You can also see screen freezing and system stuck at certain point. You cannot be able to copy the file on the hard drive you are using and it shows you that the media you are using is read only.

Causes –

You can get “Invalid ms-dos function error when copying files” on your computer due to the corruption in the hard drive or the drive on which you are trying to copy or move the files. Due to the incompatibility of the hard drive the error issue may also get into it. Virus infection, corrupt Windows registry settings, misconfigured system files, missing DLL files, etc are some of the other reasons.

How to resolve “Invalid ms-dos function error when copying files”

  1. Click start and go to the Run.
  2. Type regedit in the Run box and hit enter.
  3. Find and click on HKEY_LOCAL_MACHINE\SOFTWARE\Policies\ Microsoft\Windows\System
  4. Click on new in the edit menu and click on DWORD
  5. There you have to type CopyFileBufferedSynchronousIo to name the new entry and press enter.
  6. Right click on CopyFileBufferedSynchronousIo and click on modify.
  7. Type 1 in the value data box and then click OK and exit the registry editor.

With these manual steps you can get rid of the “Invalid ms-dos function error when copying files” from your computer very easily. But one thing you should take care that before going with the manual process you should create a backup of the registry first. You can also use Advanced System Repair pro tool to resolve the issue automatically if manual method doesn’t work properly.


Compatible with the Windows 8 32-bit and 64-bit Operating System, Windows 7 32-bit and 64-bit Operating System, Windows Vista 32-bit and 64-bit, Windows XP 32-bit
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Advanced System Repair tool is the most recommended tool that is used to get rid of almost every Windows error in your Windows computer. With the help of this tool you can scan and repair the whole errors manually. It will also enhance the performance of the computer very much.

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