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Momentus 5400.4 SATA Product Manual, Rev. B (Draft 02)
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**During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and
power to operational levels.
***Typical notebooks will pull power to the drive when entering S3 and S4; while in the S3 and S4 states, drive sleep and drive standby
modes will not contribute to battery power consumption.
2.2 Formatted capacity
*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
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.
Model Formatted capacity* Guaranteed sectors Bytes per sector
ST9250827AS 250 Gbytes 488,397,168 512
ST9200827AS 200 Gbytes 390,721,968 512
ST9160827AS 160 Gbytes 312,581,808 512
ST9120817AS 120 Gbytes 234,441,648 512
Cylinders Read/write heads Sectors per track
16,383 16 63