VintageQuantum ProDrive ELS #PI12SO11 127MB SCSI 3.5" Hard Disk Drive. Spins up and does it's automatic seek test, no strange noises. Believed to be working, but no way to properly test, so sold AS-IS with NO RETURNS. I cannot guarantee a 30 year old hard drive, with that said, it way work perfectly fine, it may not. This is part of the gamble one makes when purchasing an old drive like this. Was removed from an external hard drive enclosure that was used with an Atari ST. Never reformatted and I do not have an Atari ST to be able to see if there's any data on it still.