Part Number of Manufacturer: WD5000AAKX 500 GB of capacity 7200 RPM is the rotational speed. 16 MB of cache SATA interface Six Gbps Startled: Functioning: 30 G at 2 ms Inactive: 350 G at 1 ms Peak power dissipation (A, ±10%): 1.77, average: 12VDC Read/Write: 6.0 W 5.6 W idle Standby: 0.9 W Sleep: 0.9 W Dimensions: 3.5 inches Measurements (WxLxH): 101.6 x 147 x 25.4 mm / 4.000 x 5.787 x 1.028 inches Weight: 450.0 g/0.99 lbs