Seagate Desktop HDD Product Manual, Rev. J
6
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
1
Disks
1
Bytes per sector
(4K physical emulated at 512-byte sectors)
4096
Default sectors per track
63
Default read/write heads
16
Default cylinders
16,383
Recording density (max)
1413kb/in
Track density (avg)
236ktracks/in
Areal density (avg)
329Gb/in
2
Spindle speed
7200 RPM
Internal data transfer rate (max)
1695Mb/s
Average Data Rate, read/write (MB/s)
125MB/s
Maximum sustained data transfer rate, OD read
144MB/s
I/O data-transfer rate (max.)
600MB/s
Cache buffer
16MB
Height (max)
19.98mm / 0.787 in
Width (max)
101.6mm / 4.0 in (+ 0.010 in)
Length (max)
146.99mm / 5.787 in
Weight (typical)
415g / 0.915 lb
Average latency
4.16ms
Power-on to ready (max)
<8.5s
Power-on to ready, 2.5A spin-up code option (typ)
n/a
Standby to ready (max)
<8.5s
Average seek, read (typical)
<8.5ms (read
Average seek, write (typical)
<9.5ms (write)
Startup current (typical) 12V
2.0A
Voltage tolerance (including noise)
5V: ±5%
12V: +10% / -7.5%
Ambient temperature
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)
Relative humidity
5% to 95% (operating)
5% to 95% (non-operating)
Relative humidity gradient (max)
30% per hour
Wet bulb temperature (max)
37.7°C (operating)
40.0°C (non-operating)
Altitude, operating
–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)
Operational shock (max)
70 Gs at 2ms
Non-operational shock (max)
350 Gs at 2ms
Vibration, operating
2Hz to 22Hz: 0.25 Gs, Limited displacement
22Hz to 350Hz: 0.50 Gs
350Hz to 500Hz: 0.25 Gs
