Seagate ST3120815AS manual Drive specification, ST3250620AS, ST3250820AS, ST3250410AS, ST3250310AS

Table 6:	Drive specifications summary for 250 Gbyte models
Drive specification		ST3250620AS	ST3250820AS	ST3250410AS	ST3250310AS
Formatted capacity (512 bytes/sector)*		250 Gbytes
Guaranteed sectors		488,397,168
Heads		3		2
Discs		2		1
Bytes per sector		512
Default sectors per track		63
Default read/write heads		16
Default cylinders		16,383
Recording density		769 kbits/in avg		1,049 kbits/in avg
Track density		141 ktracks/in avg		155 ktracks/in avg
Areal density		109 Gbits/in2 avg		163 Gbits/in2 avg
Spindle speed		7,200 RPM
Internal data transfer rate		1,030 Mbits/sec max		1,212 Mbits/sec max
Sustained data transfer rate OD (read)		72 Mbytes/sec max		106 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		16 Mbytes	8 Mbytes	16 Mbytes	8 Mbytes
Height (max)		26.1 mm (1.028 inches)		19.99 mm (.787 inches)
Width (max)		101.85 mm (4.010 inches)
Length (max)		146.99 mm (5.787 inches)
Weight (typical)		600 grams (1.32 lb.)		380 grams (0.838lb.)
Average latency		4.16 msec
Power-on to ready		11 sec max		7.9 sec max
Standby to ready		11 sec max		7.9 sec max
Track-to-track seek time		<0.8 msec typical read,		<0.8 msec typical read,
		<1.0 msec typical write		<1.0 msec typical write
Average seek, read		<8.5 msec typical		<11.0 msec typical
Average seek, write		<10.0 msec typical		<12.0 msec typical
Startup current (typical) 12V (peak)		2.8 amps		2.0 amps
Voltage tolerance (including noise)		5V ± 5%
		12V ± 10%
Ambient temperature		0° to 60°C per hour max (operating)
		–40° to 70°C per hour max (nonoperating)
Temperature gradient		20°C (operating)
		30°C (nonoperating)
Relative humidity		5% to 90% (operating)
		5% to 95% (nonoperating)
Relative humidity gradient		30% per hour max
Wet bulb temperature		37.7°C max (operating)
		37.7°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		68 Gs max at 2 msec		63 Gs max at 2 msec
Non-Operational Shock		350 Gs max at 2 msec

14 Barracuda 7200.10 Serial ATA Product Manual, Rev. K