Seagate ST3750840ACE manual Drive specification ST3320820ACE ST3300820ACE ST3250820ACE

Table 2:	Drive specifications summary for 320, 300, and 250 Gbyte models
Drive specification		ST3320820ACE		ST3300820ACE	ST3250820ACE
Formatted Gbytes (512 bytes/sector)*		320		300	250
Guaranteed sectors		625,142,448		586,072,368	488,397,168
Bytes per sector		512
Default sectors per track		63
Default read/write heads		16
Default cylinders		16,383
Recording density, max		781 kbits/in			813 kbits/in
Track density, max		145 ktracks/in
Areal density, max		114.4 Gbits/in2
Spindle speed		7,200 RPM
Internal data transfer rate, max		1,030 Mbits/sec
Sustained data transfer rate, max		72 Mbytes/sec
I/O data-transfer rate, max		100 Mbytes/sec
ATA data-transfer modes supported		PIO modes 0–4
		Multiword DMA modes 0–2
		Ultra DMA modes 0–5
Cache buffer		8 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		580 grams
Average latency		4.16 msec
Power-on to ready, max		16 sec
Standby to ready, max		16 sec
Track-to-track seek time, typical		<0.8 msec (read),	<1.0 msec (write)
Average seek, read, typical		<11.0 msec
Average seek, write, typical		<12.0 msec
Startup current (typical) 12V (peak)		2.0 amps
Voltage tolerance (including noise)		5V ± 5%
		12V ± 10%
Ambient temperature
operating		0° to 65°C
nonoperating		–40° to 70°C
Temperature gradient, max		20°C per hour (operating)
		30°C per hour (nonoperating)
Relative humidity		5% to 90% (operating)
		5% to 95% (nonoperating)
Relative humidity gradient, per hour max		30%
Wet bulb temperature, max		37.7°C (operating)
		37.7°C (nonoperating)
Altitude, operating		–60.96 m to 3,048 m
		(–200 ft. to 10,000+ ft.)
Altitude, nonoperating, max		–60.96 m to 12,192 m below mean sea level
		(–200 ft. to 40,000+ ft. below mean sea level
Operational Shock, max		63 Gs at 2 msec
Non-Operational Shock, max		300 Gs at 2 msec
Vibration, operating		5–22 Hz: 0.25 Gs, Limited displacement
		22–350 Hz: 0.50 Gs
		350–500 Hz:: 0.25 Gs

6 DB35.3 Series PATA Product Manual, Rev. B