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8 Barracuda 7200.11 Serial ATA Product Manual, Rev. G
Table 3: Drive specifications summary for 500 Gbyte models
Drive specification ST3500320AS ST3500620AS ST3500820AS
Formatted capacity (512 bytes/sector)* 500 Gbytes
Guaranteed sectors 976,773,168
Heads 4
Discs 2
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 8 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) 543 grams ( 1.199 lb.)
Average latency 4.16 msec
Power-on to ready 20 sec max
Standby to ready 14 sec max
Track-to-track seek time <0.8 msec typical read;
<1.0 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