How can I remove write protection from a hard disk
and if you wish, you may continue the next troubleshooting at your own risk.
Destructive write test
Destructive write tests often solve the problem when external storage device file tables are corrupted. Although you can access the device in most cases, the chances of finding old data on these devices are slim. Almost all destructive write checks completely destroy the file allocation table and create a new one. You may also need to format the disk before you can store data on it – after the test.