2.9Power specifications
The drive receives DC power (+5V) through the interface connector.
2.9.1Power consumption
Power requirements for the drives are listed in the table on page 7. Typical power measurements are based on an average of drives tested, under nominal conditions, using 5.0V input voltage at 25°C ambient temperature.
•Spinup power
Spinup power is measured from the time of
•Seek mode
During seek mode, the read/write actuator arm moves toward a specific position on the disc surface and does not execute a read or write operation. Servo electronics are active. Seek mode power is measured based on three random seek operations every 100 msecs. This mode is not typical.
•Read/write power and current
Read/write power is measured with the heads on track, based on three 63 sector read or write operations every 100 msecs.
•Operating power and current
Operating power is measured using 40 percent random seeks, 40 percent read/write mode (1 write for each 10 reads) and 20 percent drive idle mode.
•Idle mode power
Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in a random track location.
•Standby mode
During Standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/ write electronics are in
Table 2: | DC power |
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Power dissipation (watts) | Average (watts, 25° C) | 5V typ amps | |
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Spinup |
| — | 1.2 |
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Idle, performance mode | 2.50 | 0.5 | |
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Operating 40% r/w. |
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40% seek, 20% inop. | 2.87 | 0.72 | |
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Seeking |
| 2.4 | 0.48 |
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Read |
| 2.4 | 0.48 |
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Write |
| 2.4 | 0.48 |
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Standby |
| 0.36 | 0.07 |
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Sleep |
| 0.36 | 0.07 |
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*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.
Momentus Blade Server Product Manual, Rev. B | 7 |
