3.5" NAS External Mobile Solution with 7200RPM 400GB USB 2.0 10-100NIC 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 10-100 Network Interface and UBS 2.0 NAS Capacities 400GB