Seagate ST31000528AS, ST3160318AS, ST3250318AS Drive specifications summary for 250 Gbyte models

Table 3:	Drive specifications summary for 250 Gbyte models
Drive specification		ST3250318AS	ST3160318AS
Formatted capacity (512 bytes/sector)*		250 Gbytes	160 Gbytes
Guaranteed sectors		488,397,168	312,581,808
Heads		1
Discs		1
Bytes per sector		512
Default sectors per track		63
Default read/write heads		16
Default cylinders		16,383
Recording density		1413 kbits/in max
Track density		236 ktracks/in avg
Areal density		329 Gbits/in2 avg
Spindle speed		7,200 RPM
Internal data transfer rate		1695 Mbits/sec max
Sustained data transfer rate OD		125 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		8 Mbytes
Height (max)		19.98 mm (0.787 inches)
Width (max)		101.6 mm (4.000 inches) +/- 0.010 inches
Length (max)		146.99 mm (5.787 inches)
Weight (typical)		415 grams (0.915 lb.)
Average latency		4.16 msec
Power-on to ready		<8.5 sec max
Standby to ready		<8.5 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)		2.0 amps
Voltage tolerance (including noise)		5V +10% / -7.5%
		12V +10% / -7.5%
Ambient temperature		0° to 60°C (operating)
		–40° to 70°C (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
		(–1000 ft. to 10,000+ ft.)
Altitude, nonoperating		–60.96 m to 12,192 m
(below mean sea level, max)		(–1000 ft. to 40,000+ ft.)
Operational Shock		70 Gs max at 2 msec
Non-Operational Shock		350 Gs max at 2 msec

8 Barracuda 7200.12 Serial ATA Product Manual, Rev. B