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Barracuda ES Serial ATA Product Manual, Rev. D 15
2.4 Recording and interface technology
2.5 Physical characteristics
750GB 500GB 400GB 320GB 250GB
Interface Serial ATA (SATA)
Recording method Perpendicular
Recording density, KBPI (kbits/inch max) 926 813 781 813
Track density, KTPI (ktracks/inch avg) 145
Areal density (Gbits/inch
2
avg) 128.2 114.4
Spindle speed (RPM) (± 0.2%) 7,200
Internal data transfer rate (Mbits/sec max) 1,030
Sustained data transfer rate (Mbytes/sec max) 78 72
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
ST3750640NS and ST3750840NS 720 grams (1.59 lbs)
ST3500630NS, ST3500830NS, ST3400620NS,
ST3400820NS, ST3320620NS and ST3320820NS
635 grams (1.4 lbs)
ST3250620NS and ST3250820NS 580 grams (1.28 lbs)
Cache buffer
ST3750640NS
ST3500630NS
ST3400620NS
ST3320620NS
ST3250620NS
16 Mbytes (16,384 kbytes)
ST3750840NS
ST3500830NS
ST3400820NS
ST3320820NS
ST3250820NS
8 Mbytes (8,192 kbytes)