WD Blue 250 GB Mobile Hard Drive: 2.5 Inch, 5400 RPM, SATA II, 8 MB Cache - WD2500BPVT Capacity: 250 GB Rotational Speed: 5400 rpm Cache: 8 MB Interface: SATA 3 Gb/s Data transfer rate(Max)Buffer to host: 3 Gb/s Host to/from drive(sustained): 116 MB/s Average latency: 5.5 ms Electrical Specifications:5VDC ?10% (A, peak): 1.0 Power Dissipation: Read/Write - 2.5 W; Idle - 0.85 W; Standby - 0.2 W; Sleep - 0.2 W Shock: Operating: 350G @ 2ms(read) Non-operating: 1000G @ 2ms ROHS Compliant