Seagate 7200-RPM Formatted capacity, Default logical geometry, Physical organization, LBA mode

3.2Formatted capacity

Model	Formatted capacity*	Guaranteed sectors	Bytes per sector
			(logical)
ST9750423AS, ST9750423ASG,	750GB	1,465,149,168
ST9750422AS, ST9750420AS and
ST9750420ASG
ST9640424AS, ST9640423AS and	640GB	1,250,263,728	512
ST9640423ASG
ST9500424AS, ST9500423AS and	500GB	976,773,168
ST9500423ASG

*One Gbyte 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 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.

3.3Default 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 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

6 Momentus Product Manual, Rev. B