Seagate STBD2000101, STBD3000100 manual Drive Specifications, ST500DM002, ST320DM000, ST250DM000

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Table 2 Drive specifications summary for 500GB, 320GB and 250GB models

Drive Specification*	ST500DM002	ST320DM000	ST250DM000
Formatted capacity**	500GB	320GB	250GB
Guaranteed sectors	976,773,168	625,142,448	488,397,168
Heads	2	2	1
Disks	1	1	1
Bytes per sector (4K physical	4096	4096	4096
emulated at 512-byte sectors)
Default sectors per track	63	63	63
Default read/write heads	16	16	16
Default cylinders	16,383	16,383	16,383
Recording density (max)	1413kb/in	1413kb/in	1413kb/in
Track density (avg)	236ktracks/in	236ktracks/in	236ktracks/in
Areal density (avg)	329Gb/in2	329Gb/in2	329Gb/in2
Spindle speed	7200 RPM	7200 RPM	7200 RPM
Internal data transfer rate	1695Mb/s	1695Mb/s	1695Mb/s
(max)
Average Data Rate, read/write	125MB/s	125MB/s	125MB/s
(MB/s)
Maximum sustained data	144MB/s	144MB/s	144MB/s
transfer rate, OD read (MB/s)
I/O data-transfer rate (max.)	600MB/s	600MB/s	600MB/s
Cache buffer	16MB	16MB	16MB
Height (max)	19.98mm / 0.787 in	19.98mm / 0.787 in	19.98mm / 0.787 in
Width (max)	101.6mm / 4.0 in (+ 0.010 in)	101.6mm / 4.0 in (+ 0.010 in)	101.6mm / 4.0 in ( + 0.010 in)
Length (max)	146.99mm / 5.787 in	146.99mm / 5.787 in	146.99mm / 5.787 in
Weight (typical)	415g / 0.915 lb	415g / 0.915 lb	415g / 0.915 lb
Average latency	4.16ms	4.16ms	4.16ms
Power-on to ready (max)	<8.5s	<8.5s	<8.5s
Power-on to ready, 2.5A	n/a	n/a	n/a
spin-up code option (typical)
Standby to ready (max)	<8.5s	<8.5s	<8.5s
Average seek, read (typical)	<8.5ms (read	<8.5ms (read	<8.5ms (read)
Average seek, write (typical)	<9.5ms (write)	<9.5ms (write)	<9.5ms (write)
Startup current (typical) 12V	2.0A	2.0A	2.0A
Voltage tolerance (including	5V: ±5%	5V: ±5%	5V: ±5%
noise)	12V: +10% / -7.5%	12V: +10% / -7.5%	12V: +10% / -7.5%
	0° to 60°C (operating)	0° to 60°C (operating)	0° to 60°C (operating)
Ambient temperature			–40° to 70°C (non-operating)
	–40° to 70°C (non-operating)	–40° to 70°C (non-operating)
	20°C per hour max (operating)	20°C per hour max (operating)	20°C per hour max (operating)
Temperature gradient	30°C per hour max (non-	30°C per hour max	30°C per hour max (non-operat-
	operating)	(non-operating)	ing)
Relative humidity	5% to 95% (operating)	5% to 95% (operating)	5% to 95% (operating)
	5% to 95% (non-operating)	5% to 95% (non-operating)	5% to 95% (non-operating)
Relative humidity gradient	30% per hour	30% per hour	30% per hour
(max)
Wet bulb temperature (max)	37.7°C (operating)	37.7°C (operating)	37.7°C (operating)
	40.0°C (non-operating)	40.0°C (non-operating)	40.0°C (non-operating)
Altitude, operating	–304.8m to 3048m	–304.8m to 3048m	–304.8m to 3048m
	(–1000 ft to 10,000+ ft)	(–1000 ft to 10,000+ ft)	(–1000 ft to 10,000+ ft)
Altitude, non-operating	–304.8m to 12,192m	–304.8m to 12,192m	–304.8m to 12,192m
(below mean sea level, max)	(–1000 ft to 40,000+ ft)	(–1000 ft to 40,000+ ft)	(–1000 ft to 40,000+ ft)

Barracuda SATA Product Manual, Rev. G 13