Especially in the case of SD cards, physical locks often prove to be insurmountable forms of write protection until they’re disabled. If your lock mechanism has been broken, you might be able to fix it.
Plug the drive into your Mac. Change the drive’s format to the “Mac OS Extended (Journaled)” format.
You may have to navigate through additional files after doing so to find the file.
You may have to navigate through additional folders after doing so to find the file.
Select the “StorageDevicePolicies” key that you just created. Click Edit Select New Click DWORD (32-bit) Value Type in WriteProtect and press ↵ Enter.
If your flash drive or CD still won’t register as writable, you’ll need to take it into a data recovery service to recover its data.
If you’re on a recent model of Mac, you may need to get an adapter that plugs into one of your Mac’s USB-C ports for your removable item.
If you don’t see Go at the top of the screen, click the desktop or the blue, face-like Finder icon in your Mac’s Dock to make it appear.
If the problem with the item is hardware-based, you’ll need to take the drive into a data recovery service to attempt to save the item’s contents.
