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Barracuda Serial ATA V Product Manual, Rev. B 3
2.0 Drive specifications
Unless otherwise noted, all specifications are measured under ambient con-
ditions, at 25°C, and nominal power. For convenience, the phrases the drive
and this drive are used throughout this manual to indicate the ST3120023AS,
ST380023AS and ST360015AS models.
2.1 Specification summary table
The specifications listed in this table are for quick reference. For details on
specification measurement or definition, see the appropriate section of this
manual.
Table 1: Drive specifications
Drive specification ST3120023AS ST380023AS ST360015AS
Formatted Gbytes
(512 bytes/sector)
120 80 60
Guaranteed sectors 234,441,648 156,301,488 117,231,408
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Physical read/write heads 4 3 2
Discs 2 2 1
Recording density in BPI
(bits/inch max)
542,000
Track density TPI
(tracks/inch max)
78,000
Areal density
(Mbits/inch
2
max)
42,200
Spindle speed (RPM) 7,200
Max. Internal transfer rate
(Mbits/sec max)
570
Sustained transfer rate
(Mbytes/sec)
27 to 44
I/O data transfer rate
(Mbytes/sec max)
150