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12 Barracuda ES Serial ATA Product Manual, Rev. D
Table 5: Drive specifications summary for 250 Gbyte models
Drive specification ST3250620NS ST3250820NS
Formatted Gbytes (512 bytes/sector)* 250
Guaranteed sectors 488,397,168
Heads 3
Discs 2
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Recording density, KBPI (kbits/in max) 813
Track density, KTPI (ktracks/in avg.) 145
Areal density, (Gbits/in
2
avg) 114.4
Spindle speed (RPM) 7,200
Internal data transfer rate (Mbits/sec max) 1,030
Sustained data transfer rate OD (Mbytes/sec max) 72
I/O data-transfer rate (Mbytes/sec max) 300
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 (mm max) 26.1 mm (1.028 inches)
Width (mm max) 101.6 mm (4.000 inches) +/- 0.010 inches
Length (mm max) 146.99 mm (5.787 inches)
Weight (max) 580 grams (1.28 lb.)
Average latency (msec) 4.16
Power-on to ready (sec max) 11 sec
Standby to ready (sec max) 15 sec
Track-to-track seek time (msec typical) <0.8 (read)
<1.0 (write)
Average seek, read (msec typical) <8.5
Average seek, write (msec typical) <10.0
Startup current (typical) 12V (peak) 2.8 amps
Voltage tolerance (including noise) 5V ± 5%
12V ± 10%
Ambient temperature 5° to 55°C (operating)
–40° to 70°C (nonoperating)
Temperature gradient (°C per hour max) 20°C (operating)
30°C (nonoperating)
Relative humidity 5% to 90% (operating)
5% to 95% (nonoperating)
Relative humidity gradient 30% per hour max
Wet bulb temperature (°C max) 37.7 (operating)
37.7 (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.)
Operational Shock (max at 2 msec) 63 Gs
Non-Operational Shock (max at 2 msec) 350 Gs