Hard Seagate Momentus ST9640423AS 640 Gb 5400 Rpm SATA

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  Hard Disk Model   SEAGATE ST9640423AS   Disk Family   Momentus 5400 640423   Form Factor   2.5"   Capacity   640 GB (640 x 1 000 000 000 bytes)   Number Of Disks   2   Number Of Heads   4   Rotational Speed   5400 RPM   Rotation Time   11.11 ms   Average Rotational Latency   5.56 ms   Disk Interface   Serial-ATA/300   Buffer-Host Max. Rate   300 MB/seconds   Buffer Size   16384 KB   Drive Ready Time (typical)   3.6 seconds   Average Seek Time   11 ms   Track To Track Seek Time   1.5 ms   Full Stroke Seek Time   27 ms   Width   69.85 mm (2.75 inch)   Depth   100.35 mm (3.95 inch)   Height   9.5 mm (0.37 inch)   Weight   115 grams (0.25 pounds)   Acoustic (Idle)   2.3 Bel   Acoustic (Min performance and volume)   2.5 Bel   Acoustic (Max performance and volume)   3.0 Bel   Required Power For Spinup   1200 mA   Power Required (Seek)   2.4 W   Power Required (Idle)   1.2 W   Power Required (Standby)   0.36 W   Manufacturer   Seagate Technology