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6 Barracuda 7200.11 Serial ATA Product Manual, Rev. G
Table 2: Drive specifications summary for 640 Gbyte models
Drive specification ST3640330AS ST3640630AS
Formatted capacity (512 bytes/sector)* 640 Gbytes
Guaranteed sectors 1,250,284,896
Heads 6
Discs 3
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Recording density 1090 kbits/in max
Track density 150 ktracks/in avg
Areal density 164 Gbits/in
2
avg
Spindle speed 7,200 RPM
Internal data transfer rate 1287 Mbits/sec max
Sustained data transfer rate OD 105 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 32 Mbytes 16 Mbytes
Height (max) 26.1 mm (1.028 inches)
Width (max) 101.6 mm (4.000 inches) +/- 0.010 inches
Length (max) 146.99 mm (5.787 inches)
Weight (typical) 633 grams ( 1.396 lb.)
Average latency 4.16 msec
Power-on to ready 20 sec max
Standby to ready 15 sec max
Track-to-track seek time <1.0 msec typical read;
<1.2 msec typical write
Average seek, read <8.5 msec typical
Average seek, write <9.5 msec typical
Startup current (typical) 12V (peak) 3.0 amps
Voltage tolerance (including noise) 5V +10% / -7.5%
12V +10% / -7.5%
Ambient temperature 0° to 60°C per hour max (operating)
–40° to 70°C per hour max (nonoperating)
Temperature gradient 20°C per hour max (operating)
30°C per hour max (nonoperating)
Relative humidity 5% to 95% (operating)
5% to 95% (nonoperating)
Relative humidity gradient 30% per hour max
Wet bulb temperature 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.)
Operational Shock 63 Gs max at 2 msec
Non-Operational Shock 300 Gs max at 2 msec