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6 Barracuda 7200.7 Serial ATA Product Manual, Rev. N
2.4 Physical organization
2.5 Recording and interface technology
2.5.1 Physical characteristics
Drive model Read/write heads Number of discs
ST3200822AS, ST3160827AS, ST3160023AS and ST3160021AS 4 2
ST3120827AS, ST3120026AS and ST3120022AS 3 2
ST380817AS, ST380013AS and ST380011AS 2 1
ST340111AS and ST340014AS 1 1
Interface Serial ATA (SATA)
Recording method 16/17 EPRML
Recording density BPI (bits/inch max) 595,000 (671,500 on ST3200822AS model)
Track density TPI (tracks/inch max) 94,600 (98,000 on ST3200822AS model)
Areal density (Gbits/inch
2
max) 56.3 (68.5 on ST3200822AS model)
Spindle speed (RPM) (± 0.2%) 7,200
Maximum Internal transfer rate (Mbytes/sec) 85.4
Sustained transfer rate OD (Mbytes/sec max) 58
I/O data-transfer rate (Mbytes/sec max) 150 (SATA 1.0)
Interleave 1:1
Cache buffer
ST3200822AS, ST3160827AS, ST3160023AS, ST3120827AS,
ST3120026AS, ST380817AS, ST380013AS and ST340111AS
ST3160021AS, ST3120022AS, ST380011AS, and ST340014AS
8 Mbytes
2 Mbytes
Drive specification
Maximum height
(mm)
(inches)
26.035
1.028
Maximum width
(mm)
(inches)
101.6
4.00
Maximum length
(mm)
(inches)
146.99
5.787
Typical weight
(grams)
(pounds)
635
1.4