Seagate ST3120827AS, ST3120026AS manual Formatted capacity, Default logical geometry, LBA mode

Table 2:	Drive specifications
			ST3160827AS	ST3120827AS	ST380817AS
Drive specification		ST3200822AS	ST3160023AS	ST3120026AS	ST380013AS	ST340111AS
			ST3160021AS	ST3120022AS	ST380011AS	ST340014AS
Contact start-stop cycles		50,000
(25°C, 40% relative humidity)
Supports Hotplug operation per SATA II		Yes
specification

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

**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.

2.2Formatted capacity

Model	Formatted capacity*	Guaranteed sectors	Bytes per sector
ST3200822AS	200 Gbytes	390,721,968	512
ST3160827AS
ST3160023AS	160 Gbytes	312,581,808	512
ST3160021AS
ST3120827AS
ST3120026AS	120 Gbytes	234,441,648	512
ST3120022AS
ST380817AS
ST380013AS	80 Gbytes	156,301,488	512
ST380011AS
ST340111AS	40 Gbytes	78,165,360	512
ST340014AS

*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.

Barracuda 7200.7 Serial ATA Product Manual, Rev. N 5