6 DB35.3 Series PATA Product Manual, Rev. C
Table 2: Drive specifications summary for 320, 300, and 250 Gbyte models
Drive specification ST3320820ACE ST3300820ACE ST3250820ACE
Formatted Gbytes (512 bytes/sector)* 320 300 250
Guaranteed sectors 625,142,448 586,072,368 488,397,168
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Recording density, max 781 kbits/in 813 kbits/in
Track density, max 145 ktracks/in
Areal density, max 114.4 Gbits/in
2
Spindle speed 7,200 RPM
Internal data transfer rate, max 1,030 Mbits/sec
Sustained data transfer rate, max 72 Mbytes/sec
I/O data-transfer rate, max 100 Mbytes/sec
ATA data-transfer modes supported PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–5
Cache buffer 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 580 grams
Average latency 4.16 msec
Power-on to ready, max 16 sec
Standby to ready, max 16 sec
Track-to-track seek time, typical <0.8 msec (read), <1.0 msec (write)
Average seek, read, typical <11.0 msec
Average seek, write, typical <12.0 msec
Startup current (typical) 12V (peak) 2.0 amps
Voltage tolerance (including noise) 5V ± 5%
12V ± 10%
Ambient temperature
operating
nonoperating
0° to 65°C
–40° to 70°C
Temperature gradient, max 20°C per hour (operating)
30°C per hour (nonoperating)
Relative humidity 5% to 90% (operating)
5% to 95% (nonoperating)
Relative humidity gradient, per hour max 30%
Wet bulb temperature, max 37.7°C (operating)
37.7°C (nonoperating)
Altitude, operating –60.96 m to 3,048 m
(–200 ft. to 10,000+ ft.)
Altitude, nonoperating, max –60.96 m to 12,192 m below mean sea level
(–200 ft. to 40,000+ ft. below mean sea level
Operational Shock, max 63 Gs at 2 msec
Non-Operational Shock, max 300 Gs at 2 msec
Vibration, operating 5–22 Hz: 0.25 Gs, Limited displacement
22–350 Hz: 0.50 Gs
350–500 Hz:: 0.25 Gs
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