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6 Momentus Product Manual, Rev. D
Table 2: Drive specifications for 320, 250 and 160GB models
Drive specification ST9320312AS ST9320310AS ST9250310AS ST9160316AS
Formatted GB* 320 250 160
guaranteed logical blocks 625,142,448 488,397,168 312,581,808
bytes per physical sector 4096 512 512 512
Physical read/write heads 2 1
Discs 1
Cache (MB) 8
Recording density in BPI (bits/in avg) 1560k
Track density TPI (tracks/in avg) 325k
Areal density (Gb/in
2
avg) 507
Spindle speed (RPM) 5400
Average latency (ms) 5.2
Internal transfer rate (Mb/s max) 1175
I/O data transfer rate (MB/s max) 300
ATA data-transfer modes supported SATA 1.0, Serial ATA Revision 2.6
PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–6
Height 9.5 +/- 0.2 mm (0.374 +/-.008in)
Width 69.85 mm +/- 0.25 mm (2.75 +/- 0.010in)
Length 100.35 + 0.20 / - 0.25 mm (3.951 + 0.008 / - 0.010in)
Weight <100 g (0.220 lb)
Power-on to ready (sec typical) 3.6
Power-on to ready (sec max) 4.5
Standby to ready (sec typical) 2.5
Standby to ready (sec max) 3.5
Track-to-track seek time, read (ms typical) 1.5
Average seek, read (ms typical) 13.0
Full-stroke seek, read (ms max) 27.0
Startup current, +5V (max) 1.0A
Seek power (typical) 1.3W
Read/write power (typical) Read: 1.25W; Write: 1.65W
Idle mode, low power (typical) 0.47W
Standby mode 0.12W (typical)***
Sleep mode 0.12W (typical)***
Voltage tolerance (including noise) +5V ± 5%
Ambient temperature 0° to 60°C (operating), –40° to 70°C (nonoperating)
Temperature gradient
(°C per hour max)
20°C (operating)
35°C (nonoperating)
Relative humidity 5% to 95% (operating)
5% to 95% (nonoperating)
Relative humidity gradient 30% per hour max
Wet bulb temperature
(°C max)
37.7 (operating)
40 (nonoperating)
Altitude, operating –304.8 m to 3048 m (–1000 ft to 10,000
ft)
Altitude, nonoperating
(meters below mean sea level, max)
–304.8 m to 12,192 m (–1000 ft to 40,000
ft)
Shock, operating (Gs max at 2ms) 350