Seagate ST9750423AS, Product Manual

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Momentus Product Manual, Rev. A 7
3.2 Formatted capacity
Model Formatted capacity* Guaranteed sectors Bytes per sector
ST9750422AS, ST9750421AS,
ST9750420AS and ST9750420ASG
750GB 1,465,149,168
512
ST9640422AS, ST9640421AS,
ST9640420AS and ST9640420ASG
640GB 1,250,284,896
ST9500424AS, ST9500423AS and
ST9500423ASG
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
ST9750422AS, ST9750421AS,
ST9750420AS and ST9750420ASG
4 2
ST9640422AS, ST9640421AS,
ST9640420AS and ST9640420ASG
4 2
ST9500424AS, ST9500423AS and
ST9500423ASG
3 1