Barracuda SATA Product Manual, Rev. G 13
www.seagate.com
Drive Specifications
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
emulated at 512-byte sectors)
4096 4096 4096
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/in
2
329Gb/in
2
329Gb/in
2
Spindle speed 7200 RPM 7200 RPM 7200 RPM
Internal data transfer rate
(max)
1695Mb/s 1695Mb/s 1695Mb/s
Average Data Rate, read/write
(MB/s)
125MB/s 125MB/s 125MB/s
Maximum sustained data
transfer rate, OD read (MB/s)
144MB/s 144MB/s 144MB/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
spin-up code option (typical)
n/a n/a n/a
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
noise)
5V: ±5%
12V: +10% / -7.5%
5V: ±5%
12V: +10% / -7.5%
5V: ±5%
12V: +10% / -7.5%
Ambient temperature
0° to 60°C (operating)
–40° to 70°C (non-operating)
0° to 60°C (operating)
–40° to 70°C (non-operating)
0° to 60°C (operating)
–40° to 70°C (non-operating)
Temperature gradient
20°C per hour max (operating)
30°C per hour max (non-
operating)
20°C per hour max (operating)
30°C per hour max
(non-operating)
20°C per hour max (operating)
30°C per hour max (non-operat-
ing)
Relative humidity
5% to 95% (operating)
5% to 95% (non-operating)
5% to 95% (operating)
5% to 95% (non-operating)
5% to 95% (operating)
5% to 95% (non-operating)
Relative humidity gradient
(max)
30% per hour 30% per hour 30% per hour
Wet bulb temperature (max)
37.7°C (operating)
40.0°C (non-operating)
37.7°C (operating)
40.0°C (non-operating)
37.7°C (operating)
40.0°C (non-operating)
Altitude, operating
–304.8m to 3048m
(–1000 ft to 10,000+ ft)
–304.8m to 3048m
(–1000 ft to 10,000+ ft)
–304.8m to 3048m
(–1000 ft to 10,000+ ft)
Altitude, non-operating
(below mean sea level, max)
–304.8m to 12,192m
(–1000 ft to 40,000+ ft)
–304.8m to 12,192m
(–1000 ft to 40,000+ ft)
–304.8m to 12,192m
(–1000 ft to 40,000+ ft)
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