Seagate ST380811AS, ST3120811AS, ST3120211AS Drive specifications summary for 120 Gbyte models

Table 2:	Drive specifications summary for 120 Gbyte models
Drive specification		ST3120811AS	ST3120211AS
Formatted Gbytes (512 bytes/sector)*		120
Heads		2
Discs		1
Guaranteed sectors		234,441,648
Bytes per sector		512
Default sectors per track		63
Default read/write heads		16
Default cylinders		16,383
Recording density, KBPI (kbits/in max)		756.09
Track density, KTPI (ktracks/in avg.)		141.95
Areal density, (Gbits/in2 avg)		103.8
Spindle speed (RPM)		7,200
Internal data transfer rate (Mbits/sec max)		867.2
Sustained data transfer rate OD (Mbytes/sec max)		80
I/O data-transfer rate (Mbytes/sec max)		300
ATA data-transfer modes supported		PIO modes 0–4
		Multiword DMA modes 0–2
		Ultra DMA modes 0–6
Cache buffer		8 Mbytes	2 Mbytes
Height (mm max)		19.99 mm (0.787 inches)
Width (mm max)		101.6 mm (4.000 inches) +/- 0.010 inches
Length (mm max)		146.99 mm (5.787 inches)
Weight (max)		380 grams (0.838 lb.)
Average latency (msec)		4.16
Power-on to ready (sec max)		<10.0 sec
Standby to ready (sec max)		<10.0 sec
Track-to-track seek time (msec typical)		<0.8 (read), <1.0 (write)
Average seek time (msec typical)		<12.9 (read, <13.9 (write)
Startup current (typical) 12V (peak)		2.8 amps
Voltage tolerance (including noise)		5V ± 5%
		12V ± 10%
Ambient temperature		0° to 60°C (operating)
		–40° to 70°C (nonoperating)
Temperature gradient (°C per hour max)		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 (°C max)		37.7 (operating)
		40.0 (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 (Gs max at 2 msec)		63
Non-Operational Shock (Gs max at 2 msec)		350 Gs
Vibration, operating		5–22 Hz: 0.25 Gs, Limited displacement
		22–350 Hz: 0.5 Gs
		350–500 Hz:: 0.25 Gs

6 Barracuda 7200.9 Serial ATA Product Manual, Rev. C