1TB SAS Seagate Constellation ES, Internal,7200 RPM,3.5inch (ST1000NM0001) GREEN LABEL Technical Details Hard Disk Model SEAGATE ST1000NM0001 Disk Family Constellation ES.1 1000NM0001 Form Factor 3.5" Capacity 1 TB (1 x 1 000 000 000 000 bytes) Number Of Disks 2 Number Of Heads 4 Rotational Speed 7200 RPM Rotation Time 8.33 ms Average Rotational Latency 4.17 ms Disk Interface SAS Buffer-Host Max. Rate 600 MB/seconds Buffer Size 65536 KB Average Seek Time 8.5 ms Track To Track Seek Time 0.7 ms Full Stroke Seek Time 18.2 ms Width 101.85 mm (4.01 inch) Depth 147 mm (5.79 inch) Height 26.1 mm (1.03 inch) Weight 640 grams (1.41 pounds) Acoustic (Idle) 2.7 Bel Acoustic (Min performance and volume) 2.9 Bel Acoustic (Max performance and volume) 2.9 Bel Required Power For Spinup 2800 mA Power Required (Seek) 12.8 W Power Required (Idle) 7.