Manufacturer's Part Number: WD10EZEX 1 TB of capacity 7200 RPM is the rotational speed. 64 MB of cache SATA3 interface Max. Rate of Data Transfer: 6 Gb/s is the buffer to host. 150 MB/s for host to/from drive (sustained) Startled: Running: 65Gs @ 2ms (read); 30Gs @ 2ms (write) Not in use: 350 Gs @ 1 ms 12VDC peak power management (A, ±10%): 2.5 6.8 Watts to read and write 6.1 watts at idle 1.2 Watts for standby Sleep: 1.2 watts Dimensions: 3.5 inches Measurements (WxLxH): 101.6 x 147.0 x 25.4 mm / 4.000 x 5.787 x 1.028 inches RoHS-compliant weight: 0.97 lbs./0.44 kg