By any chance were these drives formatted on a Mac?
If not I googled this. Not sure if it will work but use at your discretion (I did find it on a random forum)
Quote:
If you can access the files, you may be facing a lack of permission to do more than that. You can check the permission level and change it to see if that give you full access to the drive.
Go to Computer
Right click your thumb drive
Click on Properties
Click the Security tab
Select Everyone and click the Edit button in the dialoge box
In the Allow column, check the Full Control box
Click Apply and OK
This should ensure that Access Control is ruled out as the souce of the Write Protected situation.
OR -
Use DiskPart Open a command prompt window for the windows version you are using
In the command prompt type diskpart
Type list volume to identify the thumb drives volume #.
Type select volume # where # is your thumb drives # and press enter.
Type attributes disk clear readonly press enter. You should get text back saying Disk attributes cleared successfully
Remove the thumb drive, then reinsert into USB.
Check the drive in question, you should now be able to access the disk with full permissions.
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