6 Pipeline HD.2 Series SATA Product Manual, Rev. ATable 2: Drive specifications summary for 500 and 250 Gbyte models
Drive specification ST3500414CS ST3500312CS ST3250312CS
Formatted capacity
(512 bytes/sector)*
500 Gbytes 250 Gbytes
Guaranteed sectors 976,773,168 488,397,168
Heads 2 1
Discs 1
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Recording density 1417 kbits/in max
Track density 236 ktracks/in avg
Areal density 341.5 Gbits/in2 avg
Spindle speed 5,900 RPM
Internal data transfer rate 1285 Mbits/sec max
Sustained data transfer rate 120 Mbytes/sec max
I/O data-transfer rate 300 Mbytes/sec max
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 (max) 20.20 mm (0.795 inches)
Width (max) 101.85 mm (4.010 inches)
Length (max) 146.99 mm (5.787 inches)
Weight (typical) 380 grams (0.838 lb.)
Average latency 5.1 msec
Power-on to ready <6 sec typical
Standby to ready <6 sec typical
Track-to-track seek time <1.0 msec typical read;
<1.2 msec typical write
Average seek, read <14.0 msec typical
Average seek, write 5.1 msec
Startup current (typical) 12V (peak) 2.0 amps
Voltage tolerance (including noise) 5V ± 5%
12V ± 10%
Operating temperature
(Drive Case temperature)
0° to 75°C
Nonoperating temperature (Ambient) –40° to 70°C
Temperature gradient (max) 20°C per hour max (operating)
30°C per hour max (nonoperating)
Relative humidity 5% to 90% (operating)
5% to 95% (nonoperating)
Relative humidity gradient 30% per hour max
Wet bulb temperature (max) 37.7°C max (operating)
40.0°C max (nonoperating)
Altitude, operating –60.96 m to 3,048 m
(–200 ft. to 10,000+ ft.)
Altitude, nonoperating
(below mean sea level, max)
–60.96 m to 12,192 m
(–200 ft. to 40,000+ ft.)