Seagate ST9320310AS, ST9640320AS, ST9640322AS Drive specifications for 320, 250 and 160GB models

Table 2:	Drive specifications for 320, 250 and 160GB models
Drive specification		ST9320312AS	ST9320310AS	ST9250310AS	ST9160316AS
Formatted GB*		320		250	160
guaranteed logical blocks		625,142,448		488,397,168	312,581,808
bytes per physical sector		4096	512	512	512
Physical read/write heads		2			1
Discs		1
Cache (MB)		8
Recording density in BPI (bits/in avg)		1560k
Track density TPI (tracks/in avg)		325k
Areal density (Gb/in2 avg)		507
Spindle speed (RPM)		5400
Average latency (ms)		5.2
Internal transfer rate (Mb/s max)		1175
I/O data transfer rate (MB/s max)		300
ATA data-transfer modes supported		SATA 1.0, Serial ATA Revision 2.6
		PIO modes 0–4
		Multiword DMA modes 0–2
		Ultra DMA modes 0–6
Height		9.5 +/- 0.2 mm (0.374 +/-.008in)
Width		69.85 mm +/- 0.25 mm (2.75 +/- 0.010in)
Length		100.35 + 0.20 / - 0.25 mm (3.951 + 0.008 / - 0.010in)
Weight		<100 g (0.220 lb)
Power-on to ready (sec typical)		3.6
Power-on to ready (sec max)		4.5
Standby to ready (sec typical)		2.5
Standby to ready (sec max)		3.5
Track-to-track seek time, read (ms typical)		1.5
Average seek, read (ms typical)		13.0
Full-stroke seek, read (ms max)		27.0
Startup current, +5V (max)		1.0A
Seek power (typical)		1.3W
Read/write power (typical)		Read: 1.25W; Write: 1.65W
Idle mode, low power (typical)		0.47W
Standby mode		0.12W (typical)***
Sleep mode		0.12W (typical)***
Voltage tolerance (including noise)		+5V ± 5%
Ambient temperature		0° to 60°C (operating), –40° to 70°C (nonoperating)
Temperature gradient		20°C (operating)
(°C per hour max)		35°C (nonoperating)
Relative humidity		5% to 95% (operating)
		5% to 95% (nonoperating)
Relative humidity gradient		30% per hour max
Wet bulb temperature		37.7 (operating)
(°C max)		40 (nonoperating)
Altitude, operating		–304.8 m to 3048 m (–1000 ft to 10,000 ft)
Altitude, nonoperating		–304.8 m to 12,192 m (–1000 ft to 40,000 ft)
(meters below mean sea level, max)
Shock, operating (Gs max at 2ms)		350

6 Momentus Product Manual, Rev. D