Seagate ST3750630AS, ST31000340AS, ST31000640AS Drive specifications summary for 640 Gbyte models

Table 2:	Drive specifications summary for 640 Gbyte models
Drive specification		ST3640330AS	ST3640630AS
Formatted capacity (512 bytes/sector)*		640 Gbytes
Guaranteed sectors		1,250,284,896
Heads		6
Discs		3
Bytes per sector		512
Default sectors per track		63
Default read/write heads		16
Default cylinders		16,383
Recording density		1090 kbits/in max
Track density		150 ktracks/in avg
Areal density		164 Gbits/in2 avg
Spindle speed		7,200 RPM
Internal data transfer rate		1287 Mbits/sec max
Sustained data transfer rate OD		105 Mbytes/sec max
I/O data-transfer rate		300 Mbytes/sec max
ATA data-transfer modes supported		PIO modes 0–4
		Multiword DMA modes 0–2
		Ultra DMA modes 0–6
Cache buffer		32 Mbytes	16 Mbytes
Height (max)		26.1 mm (1.028 inches)
Width (max)		101.6 mm (4.000 inches) +/- 0.010 inches
Length (max)		146.99 mm (5.787 inches)
Weight (typical)		633 grams ( 1.396 lb.)
Average latency		4.16 msec
Power-on to ready		20 sec max
Standby to ready		15 sec max
Track-to-track seek time		<1.0 msec typical read;
		<1.2 msec typical write
Average seek, read		<8.5 msec typical
Average seek, write		<9.5 msec typical
Startup current (typical) 12V (peak)		3.0 amps
Voltage tolerance (including noise)		5V +10% / -7.5%
		12V +10% / -7.5%
Ambient temperature		0° to 60°C per hour max (operating)
		–40° to 70°C per hour max (nonoperating)
Temperature gradient		20°C per hour max (operating)
		30°C per hour max (nonoperating)
Relative humidity		5% to 95% (operating)
		5% to 95% (nonoperating)
Relative humidity gradient		30% per hour max
Wet bulb temperature		37.7°C max (operating)
		40.0°C max (nonoperating)
Altitude, operating		–60.96 m to 3,048 m
		(–200 ft. to 10,000+ ft.)
Altitude, nonoperating		–60.96 m to 12,192 m
(below mean sea level, max)		(–200 ft. to 40,000+ ft.)
Operational Shock		63 Gs max at 2 msec
Non-Operational Shock		300 Gs max at 2 msec

6 Barracuda 7200.11 Serial ATA Product Manual, Rev. G