IBM 1Tb 7.2K 6Gbps SATA 2.5" Hot Swap Hard Drive. The drives that I have up for auction are drives that we removed from some IBM servers that we had in service for just under 5-months - so they are very lightly used (drives range from 2 to 3,000 Power On Hours) . The IBM option number for these drives is 81Y9730 and the IBM FRU Number is 81Y9731. Drives were tested before being removed, but I will give a 14-Day warranty on them so you will have a chance to test them and make sure they are 100% functional. Thanks for looking!