Maxtor DiamondMax 21 500GB SATA/300 7200RPM 16MB Hard Drive Maxtor DiamondMax 21 STM3500630AS 500 GB SATA Hard Drive General Features: 500 GB capacity 7,200 RPM spindle speed 16 MB buffer Serial ATA interface SATA/300 transfer rate (SATA II) 4.17 ms average latency 3.5-inch form factor Power Specifications: +5V, 0.72 A +12V, 0.52 A Regulatory Approvals: cULus CE C-Tick BSMI MIC TUV