Seagate ST9250310AS Formatted capacity, Default logical geometry, Physical organization, LBA mode

3.2Formatted capacity

	Formatted	Guaranteed	Bytes per
Model	capacity*	logical blocks	physical sector
ST9640322AS	640GB	1,250,263,728
ST9400321AS	400GB	781,422,768	4096
ST9320312AS	320GB	625,142,448
ST9640320AS	640GB	1,250,263,728
ST9500320AS	500GB	976,773,168
ST9320310AS	320GB	625,142,448	512
ST9250310AS	250GB	488,397,168
ST9160316AS	160GB	312,581,808

*One GB equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment and formatting.

3.2.1LBA 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.

3.3Default 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 logical blocks as defined above.

3.4Physical organization

Drive model	Read/write heads	Number of discs
ST9640322AS
ST9640320AS	4	2
ST9500320AS
ST9400321AS
ST9320312AS
ST9320310AS	2	1
ST9250310AS
ST9160316AS	1

8 Momentus Product Manual, Rev. D