I am locked out of my Gateway laptop, the Supervisor and user passwords are clear, but the HDD requires a password I don't remember. I found instructions online suggesting I set a supervisor password, reboot and then clear the supervisor password and then reboot once again. After that it states I should be able to clear the HDD password. But when I go back in to the BIOS once I have set and cleared the supervisor password, it is still asking me for this HDD password that is long forgotten.
The ATA standard (which also covers sata drives)
Specifies a special ATA command which does a low level format which wipes the drive before clearing the on disk password
The password is held on the hard disk not the motherboard
The drive can not be accessed without entering the password
It might be cheaper to buy a new hard disk than pay a professional or PC dealer to clear the password , you then know you have a new hard drive possibly with a few years guarantee