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Barracuda ES.2 Serial ATA Product Manual, Rev. A 9
2.4 Recording and interface technology
2.5 Physical characteristics
1000GB 750GB 500GB 250GB
Interface Serial ATA (SATA)
Recording method Perpendicular
Recording density, KBPI (kbits/inch max) 1,090
Track density, KTPI (ktracks/inch avg) 150
Areal density (Gbits/inch
2
avg) 164
Spindle speed (RPM) (± 0.2%) 7,200
Internal data transfer rate (Mbits/sec max) 1287
Sustained data transfer rate (Mbytes/sec max) 105
I/O data-transfer rate (Mbytes/sec max) 300 (Ultra DMA mode 5)
Maximum height 26.1 mm (1.028 inches)
Maximum width 101.6 mm (4.000 +/- 0.010 inches)
Maximum length 146.99 mm (5.787 inches)
Max weight
ST31000340NS 665 grams (1.466 lbs)
ST3750330NS 630 grams (1.389 lbs)
ST3500320NS 530 grams (1.168 lbs)
ST3250310NS 495 grams (1.091 lbs)
Cache buffer 32 Mbytes (16,384 kbytes)