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6 Barracuda 7200.11 Serial ATA Product Manual, Rev. B
Table 2: Drive specifications summary for 320 and 160 Gbyte models
Drive specification ST3320613AS ST3320813AS ST3160813AS
Formatted capacity (512 bytes/sector)* 320 Gbytes 160 Gbytes
Guaranteed sectors 625,142,448 312,581,808
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 1250 kbits/in max
Track density 182 ktracks/in avg
Areal density 219 Gbits/in
2
avg
Spindle speed 7,200 RPM
Internal data transfer rate 1460 Mbits/sec max
Sustained data transfer rate OD 115 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) 101.6 mm (4.000 inches) +/- 0.010 inches
Length (max) 146.99 mm (5.787 inches)
Weight (typical) 368 grams ( 0.811 lb.)
Average latency 4.16 msec
Power-on to ready 11 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 <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 (operating)
–40° to 70°C (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 70 Gs max at 2 msec
Non-Operational Shock 350 Gs max at 2 msec