Here are a few things to try:
1. This can be caused by malware, are you sure your machine is clean? If not, run your ‘anti’ programs.
2. Plug in your device, right-click My Computer > Manage > Storage > Disk Management then right-click the graphic icon of the device and select Change Drive letter, then change it to one nearer the end of the alphabet.
3. Change these registry keys but create a system restore point first, just in case you have problems. Note that the keys do not necessarily exist, so don't create them as it's probably a different issue.
A.
Open a Run window (Windows key+R), type regedit, press Enter and in the left pane navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\StorageDevicePolicies, double click on WriteProtect and change Value Data to 0 (zero).
B.
Now go to HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\St orageDevicePolicies, double click on WriteProtect and change Value Data to 0 (zero).
C.
Lastly go to HKEY_LOCAL_MACHINE\SYSTEM\ControlSet003\Control\St orageDevicePolicies, double click on WriteProtect and change Value Data to 0 (zero).
Good luck.
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