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6 Momentus Product Manual, Rev. B
3.2 Formatted capacity
Model Formatted capacity* Guaranteed sectors
Bytes per sector
(log
ical)
ST9750423AS, ST9750423ASG,
ST9750422AS, ST9750420AS and
ST9750420ASG
750GB 1,465,149,168
512 ST9640424AS, ST9640423AS and
ST
9640423ASG
640GB 1,250,263,728
ST9500424AS, ST9500423AS and
ST
9500423ASG
500GB 976,773,168
*One Gbyte 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 sectors 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 sectors as defined above.
3.4 Physical organization
Drive model Read/write heads Number of discs
ST9750423AS, ST9750423ASG, ST9750422AS,
ST9750420AS and ST9750420ASG
4
2
ST9640424AS, ST9640423AS and ST9640423ASG
ST9500424AS, ST9500423AS and ST9500423ASG 4/3