Sunday, February 6, 2011


Unable To Write Or Delete Data On External USB Disk

Unable to Write/Delete data on External USB disk in Windows 7

When i connect my External USB WD hdd to a Windows  PC it is successfuly able to connect, it is able to read copy the data but i am not able to delte/write any data to it. I Connect the same HDD to Windows XP sp2 system and it works fine there. Seems like the HDD got only read only access in windows 7. How will be able to write/delete data from it ?


First of all, have you install the following hotfix for USB issue? Most USB issue can be fixed by it.

if the issue persists after installing the hotfix, please follow the steps mentioned below…

Regarding the hotfix, I think you can install it directly. The hotfix will replace/update some USB related system files which would be helpful for USB related issues.  Additional, you can also backup your files on the HDD and format it under Windows 7 as a quick fix, do you still have the same issue now?

Actually, I have had this type of issue even before for my other Device. And format is a quick fix to me (please remember to formant it under Windows 7). If you do not have other free space, you can consider copy those data to another PC (of your friends or the PC in your office).

Meanwhile, what would happen when you try to save file to this USB HDD? If you receive error message stating "The disk is write-protected.  Remove the write-protection or use another disk”, please remove write protection from your USB flash drive using the below method:

  • 1. Open start menu, in the search bar type REGEDIT and press enter. This will open the registry editor.
  • 2. Navigate to the following path:


Note: If the registry key StorageDevicePolicies does not exist, you will need to create it manually.

  • 3. Highlight StorageDevicePolicies, and then create a New DWORD (32-bit) Value named as WriteProtect.
  • 4. Double click the key WriteProtect in the right window and set the value to 0 in the Value Data Box and press OK button
  • 5. Restart your computer and try copying files into your USB drives.

If the issue persists, you may have to run the following command as a fix:

  • 1. Start > search bar -> CMD and press enter
  • 2. type< diskpart
  • 3. type< list disk
  • 4. type< select disk # (# is the number of the USB HDD you’ve pluged in)
  • 5. type< attributes disk clear readonly

Do you still have the same issue after reboot? If so, backup your files on the HDD and format it under Windows 7 as a quick fix.

Addtionally, I would like to suggest you checking the permissions of the disk. If it is read-only, try to take ownership of the disk and edit the permissions to have write/delete privilege. How to take ownership of a file or folder

Edit the permissions:

  • 1) Right click the drive.
  • 2) Hightlight Security tab.
  • 3) Select the current user.
  • 4) Click Edit and check the Allow box of Full control.
  • 5) Click Apply and OK.


About bench3 -

Haja Peer Mohamed H, Software Engineer by profession, Author, Founder and CEO of "bench3" you can connect with me on Twitter , Facebook and also onGoogle+

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January 25, 2014 at 1:27 AM delete

Yes! Finally something about sbo.