HDD become write-protected

From PCWorld ...

 

1. Open a Command prompt by clicking Start, typing command, and clicking Command Prompt.
2. Type diskpart and press Enter.
3. Type list volume and press Enter.
4. Type select volume #, where # is the number of the drive that's giving you the "write-protected" error. In my case, I ended up typing select volume 3.
5. Type attributes disk clear readonly and press Enter.
6. Type exit and press Enter.