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3.2
Formatted capacity
Model
ST9640322AS
ST9400321AS
ST9320312AS
ST9640320AS
ST9500320AS
ST9320310AS
ST9250310AS
ST9160316AS
*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
16,383
16
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
ST9640322AS
ST9640320AS
ST9500320AS
ST9400321AS
ST9320312AS
ST9320310AS
ST9250310AS
ST9160316AS
8
Formatted
Guaranteed
capacity*
logical blocks
640GB
1,250,263,728
400GB
781,422,768
320GB
625,142,448
640GB
1,250,263,728
500GB
976,773,168
320GB
625,142,448
250GB
488,397,168
160GB
312,581,808
Sectors per track
63
Read/write heads
4
2
1
Bytes per
physical sector
4096
512
Number of discs
2
1
Momentus Product Manual, Rev. D
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