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Momentus 7200.4 SATA Product Manual, Rev. C 5
2.2 Formatted capacity
Model Formatted capacity* Guaranteed sectors Bytes per sector
ST9500420AS and ST9500420ASG 500 Gbytes 976,773,168 512
ST9320423AS and ST9320423ASG 320 Gbytes 625,142,448 512
ST9250410AS and ST9250410ASG 250 Gbytes 488,397,168 512
ST9160412AS and ST9160412ASG 160 Gbytes 312,581,808 512
ST9120410AS and ST9120410ASG 120 Gbytes 234,441,648 512
ST980412AS and ST980412ASG 80 Gbytes 156,301,488 512
*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
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.
2.4 Physical organization
Drive model Read/write heads Number of discs
ST9500420AS and ST9500420ASG 4 2
ST9320423AS and ST9320423ASG 3/4 2
ST9250410AS and ST9250410ASG 2 1
ST9160412AS and ST9160412ASG 2 1
ST9120410AS and ST9120410ASG 1/2 1
ST980412AS and ST980412ASG 1 1