Samsung HD501LJ 500GB SATA2 7200rpm 16MB Hard Drive
Specifications:

Mfr Part Number: HD501LJ
Capacity: 500 GB
Rotational Speed: 7200 RPM
Cache: 16 MB
Interface: SATA 300
Max. External Transfer Rate: 300 MB/s
Seek Time: Track to Track: 0.8 ms; Average: 8.9 ms;
Full Stroke: 18 ms
Shock: Operating: 63G @ 2ms; Non-operating: 350G @ 1ms;
Dimensions (WxLxH): 4 x 5.75 x 1 inch