Hard Disk Model HITACHI HCS5C3232SLA380 Disk Family CinemaStar 5K320 Form Factor 3.5" Capacity 320 GB (320 x 1 000 000 000 bytes) Number Of Disks 1 Number Of Heads 2 Rotational Speed 5700 RPM Rotation Time 10.53 ms Average Rotational Latency 5.26 ms Disk Interface Serial-ATA/300 Buffer-Host Max. Rate 300 MB/seconds Buffer Size 8192 KB Drive Ready Time (typical) 8 seconds Average Seek Time 14 ms Track To Track Seek Time 0.8 ms Full Stroke Seek Time 27 ms Width 101.6 mm (4.00 inch) Depth 147 mm (5.79 inch) Height 26.1 mm (1.03 inch) Weight 400 grams (0.88 pounds) Required Power For Spinup 3300 mA Power Required (Seek) 7 W Power Required (Idle) 5 W Power Required (Standby) 2 W Manufacturer Hitachi Global Storage Technologies