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4 Barracuda 7200.10 Serial ATA Product Manual, Rev. B
Table 1: Drive specifications summary for 250 Gbyte models
Drive specification ST3250410AS ST3250310AS
Formatted capacity (512 bytes/sector)* 250 Gbytes
Guaranteed sectors 488,397,168
Heads 2
Discs 1
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Recording density 1,049 kbits/in max (nominal format)
Track density 155 ktracks/in avg (for nominal format)
Areal density 163 Gbits/in
2
avg (for nominal format)
Spindle speed 7,200 RPM
Internal data transfer rate 1,212 Mbits/sec max (for nominal format)
Sustained data transfer rate OD 106 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) 20.17 mm (0.794 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 4.16 msec
Power-on to ready 7.9 sec max
Standby to ready 7.9 sec max
Track-to-track seek time <0.8 msec typical read,
<1.0 msec typical write
Average seek, read <11.0 msec typical
Average seek, write <12.0 msec typical
Startup current (typical) 12V (peak) 2.0 amps
Voltage tolerance (including noise) 5V ± 5%
12V ± 10%
Ambient temperature 0° to 60°C max (operating)
–40° to 70°C max (nonoperating)
Temperature gradient 20°C (per hour maxium operating)
30°C (per hour maxium nonoperating)
Relative humidity 5% to 90% (operating)
5% to 95% (nonoperating)
Relative humidity gradient 30% per hour max
Wet bulb temperature 37.7°C max (operating)
37.7°C max (nonoperating)
Altitude, operating –304.8 m to 3,048 m
(–1000 ft. to 10,000+ ft.)
Altitude, nonoperating
(below mean sea level, max)
–304.8 m to 12,192 m
(–1000 ft. to 40,000+ ft.)
Operational Shock 63 Gs max at 2 msec
Non-Operational Shock 350 Gs max at 2 msec