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Momentus Product Manual, Rev. B 5
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
**During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and
power to operational levels.
***Typical notebooks will pull power to the drive when entering S3 and S4; while in the S3 and S4 states, drive sleep and drive standby
modes will not contribute to battery power consumption.
Write power (typical) 1.85W 2.4W
Idle mode, low power (typical) 0.55W 0.70W
Standby mode (typical) 0.15W ***
Sleep mode (typical) 0.15W ***
Voltage tolerance (including noise) +5V ± 5%
Ambient temperature 0°C to 60°C (operating)
–40°C to 70°C (nonoperating)
Temperature gradient (°C/hour max) 20°C (operating), 35°C (nonoperating)
Relative humidity 5% to 95% (operating and nonoperating)
Relative humidity gradient 30% per hour max
Wet bulb temperature (°C max) 37.7 °C (operating), 40 °C (nonoperating)
Altitude, operating –304.8 m to 3,048 m (–1,000 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 2 ms) 350
Shock, nonoperating (Gs max at 2 ms) 800
Shock, nonoperating (Gs max at 1 msec) 1000
Shock, nonoperating (Gs max at 0.5 ms) 1000
Vibration, operating 2.0 G (0 to peak, 5–200 Hz)
1.0 G (0 to peak, 200–500 Hz)
Vibration, nonoperating 5 Gs (0 to peak, 5–500 Hz)
Drive acoustics, sound power (bels)
Idle** 2.3 (typical)
2.5 (max)
Performance seek 2.6 (typical)
2.7 (max)
Nonrecoverable read errors 1 per 10
14
bits read
Annualized Failure Rate (AFR) 0.5%
Load/Unload (U/UL) cycles
25°C, 50% relative humidity
32°C, 80% relative humidity
5°C, 80% relative humidity
5°C, 10% relative humidity
55°C, 16% relative humidity
600,000 software-controlled power on/off cycles
50,000 hard power on/off cycles
600,000 software-controlled power on/off cycles
50,000 hard power on/off cycles
Warranty To determine the warranty for a specific drive, use a web browser to access the following
web page: http://www.seagate.com/www/en-us/support/warranty_&_returns_assistance
From this page, click on the “Verify Your Warranty” link. You will be asked to provide the drive
serial number, model number (or part number) and country of purchase. The system will dis-
play the warranty information for your drive.
Supports Hotplug operation per
Serial ATA Revision 2.6 specification
Yes (requires COMRESET from host after a hotplug event)
Table 1: Drive specifications for 750, 640 and 500 GB models
Drive specification
ST9750423AS
ST9750423ASG
ST9640424AS
ST9640423AS
ST9640423ASG
ST9750422AS
ST9750420AS
ST9750420ASG
ST9500424AS
ST9500423AS
ST9500423ASG