Seagate ST3500830NS, ST3250820NS, ST3250620NS Drive specifications summary for 250 Gbyte models

Table 5:	Drive specifications summary for 250 Gbyte models
Drive specification		ST3250620NS	ST3250820NS
Formatted Gbytes (512 bytes/sector)*		250
Guaranteed sectors		488,397,168
Heads		3
Discs		2
Bytes per sector		512
Default sectors per track		63
Default read/write heads		16
Default cylinders		16,383
Recording density, KBPI (kbits/in max)		813
Track density, KTPI (ktracks/in avg.)		145
Areal density, (Gbits/in2 avg)		114.4
Spindle speed (RPM)		7,200
Internal data transfer rate (Mbits/sec max)		1,030
Sustained data transfer rate OD (Mbytes/sec max)		72
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		16 Mbytes	8 Mbytes
Height (mm max)		26.1 mm (1.028 inches)
Width (mm max)		101.6 mm (4.000 inches) +/- 0.010 inches
Length (mm max)		146.99 mm (5.787 inches)
Weight (max)		580 grams (1.28 lb.)
Average latency (msec)		4.16
Power-on to ready (sec max)		11 sec
Standby to ready (sec max)		15 sec
Track-to-track seek time (msec typical)		<0.8 (read)
		<1.0 (write)
Average seek, read (msec typical)		<8.5
Average seek, write (msec typical)		<10.0
Startup current (typical) 12V (peak)		2.8 amps
Voltage tolerance (including noise)		5V ± 5%
		12V ± 10%
Ambient temperature		5° to 55°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)
		37.7 (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 (max at 2 msec)		63 Gs
Non-Operational Shock (max at 2 msec)		350 Gs

12 Barracuda ES Serial ATA Product Manual, Rev. D