Seagate ST3250820NS, ST3250620NS manual Formatted capacity, Default logical geometry, LBA mode

2.2Formatted capacity

	Formatted	Guaranteed
Model	capacity*	sectors	Bytes per sector
ST3750640NS	750 Gbytes	1,465,149,168	512
ST3750840NS	750 Gbytes	1,465,149,168	512
ST3500630NS	500 Gbytes	976,773,168	512
ST3500830NS	500 Gbytes	976,773,168	512
ST3400620NS	400 Gbytes	781,422,768	512
ST3400820NS	400 Gbytes	781,422,768	512
ST3320620NS	320 Gbytes	625,142,448	512
ST3320820NS	320 Gbytes	625,142,448	512
ST3250620NS	250 Gbytes	488,397,168	512
ST3250820NS	250 Gbytes	488,397,168	512

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

2.2.1LBA 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 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.

2.3Default 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.

14 Barracuda ES Serial ATA Product Manual, Rev. D