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8 Barracuda 7200.11 Serial ATA Product Manual, Rev. B
2.1 Formatted capacity
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
2.1.1 LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,
where n is the number of guaranteed sectors as defined above.
See Section 4.3.1, "Identify Device command" (words 60-61 and 100-103) for additional information about 48-
bit addressing support of drives with capacities over 137 Gbytes.
2.2 Default logical geometry
LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,
where n is the number of guaranteed sectors as defined above.
2.3 Recording and interface technology
Model
Formatted
capacity*
Guaranteed
sectors
Bytes per sector
ST31000333AS 1000 Gbytes 1,953,525,168 512
ST3640323AS 640 Gbytes 1,250,284,896 512
ST3320613AS
ST3320813AS
320 Gbytes 625,142,448 512
ST3160813AS 160 Gbytes 312,581,808 512
Cylinders Read/write heads Sectors per track
16,383 16 63
ST31000333AS ST3640323AS
ST3320613AS
ST3320813AS
ST3160813AS
Interface Serial ATA (SATA)
Recording method Perpendicular
Recording density (kbits/inch max) 1300 1250
Track density (ktracks/inch avg) 182
Areal density (Gbits/inch
2
avg) 228 219
Spindle speed (RPM) 7,200 ± 0.2%
Internal data transfer rate (Mbits/sec max) 1520 1460
Sustained data transfer rate (Mbytes/sec max) 120 115
I/O data-transfer rate (Mbytes/sec max) 300