Seagate Enterprise Capacity 2.5 HDD Constellation Product Manual page 12

Table 1: Drive specifications summary for 1TB, 500 and 250 GB models
Drive specification
Formatted GB (512 bytes/sector)*
Guaranteed sectors
Heads
Discs
Bytes per sector
Default sectors per track
Default read/write heads
Default cylinders
Recording density, KBPI (Kb/in max)
Track density, KTPI (Ktracks/in avg.)
2
Areal density, (Gb/in avg)
Spindle speed (RPM)
Internal data transfer rate (Mb/s max)
Sustained data transfer rate OD (MB/s max)
I/O data-transfer rate (MB/s max)
ATA data-transfer modes supported
Cache buffer
Weight: (maximum)
Average latency
Power-on to ready (sec max)
Standby to ready (sec max)
Track-to-track seek time (ms typical)
Average seek, read (ms typical)
Average seek, write (ms typical)
Startup current (typical) 12V (peak)
Voltage tolerance (including noise)
Ambient temperature
Temperature gradient (°C per hour max)
Relative humidity
Relative humidity gradient
Wet bulb temperature (°C max)
Altitude, operating
Altitude, nonoperating
(below mean sea level, max)
Operational Shock (max at 2 ms)
Non-Operational Shock (max at 2 ms)
Vibration, operating
Vibration, nonoperating
6
ST91000640NS ST9500620NS
ST91000641NS ST9500621NS
ST91000642NS ST9500622NS
1000 500
1,953,525,168 976,773,168
8 4
4 2
512
63
16
16,383
1544
270
417
7200
1304
115
600
PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–6
64 Mbytes
200 g (0.441 lb) 183 g (0.403 lb)
4.16 ms
20 sec
13 sec
0.23 read
0.44 write
7.5
8.5
2.0 amps
5V ±5%
12V ±5%
5° to 60°C (operating)
–40° to 70°C (nonoperating)
20°C (operating)
20°C (nonoperating)
5% to 95% (operating)
5% to 95% (nonoperating)
20% per hour max
28°C
–60.96 m to 3,048 m
(–200 ft. to 10,000+ ft.)
–60.96 m to 12,192 m
(–200 ft. to 40,000+ ft.)
Read 70 Gs / Write 40 Gs
400 Gs
5–500 Hz: 0.5 Gs
5–500 Hz: 3.0 Gs
Constellation.2 Serial ATA Product Manual, Rev. F
ST9250610NS
ST9250611NS
ST9250612NS
250
488,397,168
2
1
179 g (0.395 lb)