3.5" External Mobile Solution with 7200RPM 400GB With USB 2.0 Capacities 400GB PATA Interface, Sustained data transfer rates up to 150MB/sec, 10 ms average seek time, 133MB/sec max bus speed, 16MB Cache Buffer, S.M.A.R.T. compliance features, 7200 RPM USB 2.0 Contains Seagate Hard Drive