usb readonly win7

If USB device is readonly on your machine for some reason, here is one way how to fix this:
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:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies
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.
No restart was required in my case, but that adding registry key works.