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DiamondMax 21 Serial ATA Product Manual, Rev. A
Table 1: Drive specifications summary for 320 Gbyte models
Drive specification STM3320820AS STM3320620AS
Formatted capacity (512 bytes/sector)* 320 Gbytes
Guaranteed sectors 625,142,448
Heads 4
Discs 2
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Recording density 781 kbits/in max
Track density 145 ktracks/in avg
Areal density 114.4 Gbits/in
2
avg
Spindle speed 7,200 RPM
Internal data transfer rate 1,030 Mbits/sec max
Sustained data transfer rate OD 72 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) 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) 635 grams
Average latency 4.16 msec
Power-on to ready 15 sec max
Standby to ready 15 sec max
Track-to-track seek time <0.8 msec typical read; <1.0 typical write
Average seek, read <8.5 msec typical
Average seek, write <10.0 msec typical
Startup current (typical) 12V (peak) 2.8 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 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 –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 68 Gs max at 2 msec
Non-Operational Shock 350 Gs max at 2 msec