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16 DiamondMax 21 Serial ATA Product Manual, Rev. C
2.2 Formatted capacity
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
2.2.1 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.
2.3 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.
Model
Formatted
capacity*
Guaranteed
sectors
Bytes per sector
STM3500630AS 500 Gbytes 976,773,168 512
STM3320620AS 320 Gbytes 625,142,448 512
STM3320820AS 320 Gbytes 625,142,448 512
STM3250824AS 250 Gbytes 488,397,168 512
STM3250820AS 250 Gbytes 488,397,168 512
STM3250310AS 250 Gbytes 488,397,168 512
STM3160815AS 160 Gbytes 312,581,808 512
STM3160215AS 160 Gbytes 312,581,808 512
STM380815AS 80 Gbytes 156,301,488 512
STM380215AS 80 Gbytes 156,301,488 512
STM340215AS 40 Gbytes 78,165,360 512
Cylinders Read/write heads Sectors per track
16,383 16 63