RPM: 7200 RPM Form Factor: 3.5" Interface: USB 3.0 / IEEE 1394b x 2 / eSATA Cache: 32MB Dimensions: 7.2" x 6.6" x 2.3" Weight: 3.7 lbs. Features: Universal connectivity and compatibility Professional grade: 5Gb/s interface, 7200rpm drives Save space: stackable and rack-mount option Advanced power modes for energy savings Design by Neil Poulton