Boot from it.
Launch a terminal screen.
dcfldd if=/dev/zero of=/dev/sda bs=4096 conv=notrunc,noerror
Wait until it is done.
This will pretty much erase your whole hard drive.
Goto Sanderson Forensics website, and act like you are a business. Like set your fax header with a business name. This company is really picky about who they sell to. Get the hard disk utility they have there.
Get DR DOS 7 from http://www.bootdisk.com
Make the boot disk
On a different floppy, copy the hard drive utility.
With the machine off, unplug the hard drive interface cable.
Boot with the DR DOS 7 boot disk you made.
Remove that diskette
Insert the diskette with the hard drive utility on it.
Plug the interface cable back into the hard drive while leaving the machine on.
Follow the instructions for the hard drive utility.
Remove any HPA.
If setting the password on the drive fails, unplug the power connector to the hard drive for 10 seconds while leaving the computer power on. Be very careful plugging it back in. You can short your power supply to ground if you're not careful. This will only cause a shutdown, but it is alarming. Then plug it back in.
Try to set the password again.
When the unit begins erasing, unplug the interface cable, leave the power connector connected.
After about three hours, shut the machine down.
Reset the bios however your motherboard does that, usually a jumper.
Boot without the hard drive interface cable attached. You don't have to boot into anything, just turn the machine on.
Shut down again.
Attach the hard drive as usual.
Make sure everything is in working order.
Take any floppies out of the drive.
Try to install linux.
Do not install MS Windows again on this drive.