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Table 1:
Drive specifications for 750, 640 and 500 GB models
Drive specification
Formatted GB
Guaranteed sectors
Bytes per sector
Physical read/write heads
Discs
Cache (MB)
Recording density in BPI (max)
Track density TPI (tracks/inch max)
2
Areal density (Gb/in
max)
Spindle speed (RPM)
Average latency (ms)
Internal transfer rate (Gb/s max)
I/O data transfer rate (Gb/s max)
ATA data-transfer modes supported
Height
Width
Length
Weight
Power-on to ready (sec typical)
Standby to ready (sec typical)
Track-to-track seek time, read (ms
typ)
Average seek, read (ms typical)
Average seek, write (ms typical)
Startup current, +5V (max)
Seek power (typical)
Read power (typical)
Write power (typical)
Idle mode, low power (typical)
Standby mode (typical)
Sleep mode (typical)
Voltage tolerance (including noise)
Ambient temperature
Temperature gradient (°C/hour max)
Relative humidity
Relative humidity gradient
Wet bulb temperature (°C max)
Altitude, operating
Altitude, nonoperating
(meters below mean sea level, max)
Shock, operating (Gs max at 2 ms)
Momentus Product Manual, Rev. A
ST9750422AS
ST9750421AS
ST9750420AS
ST9750420ASG
750
1,465,149,168
512
4
2
16
1,586k
341k
541
7200
4.2
1305
3.0
SATA 1.0, Serial ATA Revision 2.6
PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–6
9.5 +/- 0.2 mm (0.370 +/-.008 in)
69.85 +/- 0.25 mm (2.750 +/- 0.010 in)
100.35 +0.20 / -0.25 mm (3.951 +0.008 / -0.010 in)
115 g (0.254 lb)
4.5
3.0
1.5
11.0
13.0
1.0A
2.5W
2.1W
2.3W
0.70W
0.15W ***
0.15W ***
+5V ± 5%
0°C to 60°C (operating)
–40°C to 70°C (nonoperating)
20°C (operating), 35°C (nonoperating)
5% to 95% (operating and nonoperating)
30% per hour max
37.7 °C (operating), 40 °C (nonoperating)
–304.8 m to 3,048 m (–1,000 ft to 10,000
–304.8 m to 12,192 m (–1000 ft to 40,000
350
ST9640422AS
ST9640421AS
ST9640420AS
ST9640420ASG
640
1,250,284,896
+
ft)
+
ft)
ST9500424AS
ST9500423AS
ST9500423ASG
500
976,773,168
3
5
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