HP Midline - Hard drive - 1 TB - hot-swap - 3.5" - SATA-300 - 7200 rpm 1TB 7.2K HD SATA 3.5LP 1IN HPL 1YR WTY Manufacturer Part Number 454146-B21 Storage Capacity: 1 TB Drive Type: Internal Drive Interface: SATA Rotational Speed: 7200