160GB 2.5" Hard Drive for Acer Netbooks Aspire One AO521 AO522 AO531h AO532h AO721 Laptops Interface: SATA, Capacity: 160GB, RPM: 5400RPM, Cache: 8MB, Size: 2.5 Inchs, 3.0Gb/s 160GB Upgrade Hard Drive. Major Brand: WD, Seagate, Tosbhia, Hitachi, etc. This Product 1 Year Warranty And 30 Days Money Back Guarantee.