Seagate 500 GB SATA2 7200 RPM 16 MB Hard Drive ST3500418AS - Bulk Capacity: 500 GB; Rotational Speed: 7200 rpm Cache: 16 MB; Interface: SATA 300; Max. External Transfer Rate: 300 MB/s Average Seek Time - Read: 8.5 ms, Write: 9.5 ms Shock - Operating: 70G @ 2ms, Non-operating: 350G @ 2ms Support NCQ (Native Command Queuing) Technology; RoHS Compliant