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8 Momentus Product Manual, Rev. D
3.2 Formatted capacity
Model
Formatted
capacity*
Guaranteed
logical blocks
Bytes per
physical sector
ST9640322AS 640GB 1,250,263,728
4096ST9400321AS 400GB 781,422,768
ST9320312AS 320GB 625,142,448
ST9640320AS 640GB 1,250,263,728
512
ST9500320AS 500GB 976,773,168
ST9320310AS 320GB 625,142,448
ST9250310AS 250GB 488,397,168
ST9160316AS 160GB 312,581,808
*One GB equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
3.2.1 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 logical blocks as defined above.
See Section 5.3.1, "Identify Device command" (words 60-61 and 100-103) for additional information about 48-
bit addressing support of drives with capacities over 137GB.
3.3 Default logical geometry
Cylinders Read/write heads Sectors per track
16,383 16 63
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 logical blocks as defined above.
3.4 Physical organization
Drive model Read/write heads Number of discs
ST9640322AS
ST9640320AS
4 2
ST9500320AS
ST9400321AS
ST9320312AS
ST9320310AS
2
1
ST9250310AS
ST9160316AS 1