10 Momentus Product Manual, Rev. D
3.8 Start/stop times
Time to ready Typical
Max @ 25°C
Power-on to Ready (sec) 3.6 4.5
Standby to Ready (sec) 2.5 3.5
3.9 Power specifications
The drive receives DC power (+5V) through a native SATA power connector.
3.9.1 Power consumption
Power requirements for the drives are listed in the table on page 10. Typical power measurements are based
o
n an average of drives tested, under nominal conditions, at 25°C ambient temperature.
• Spinup power
Spinup power is measured from the time of power-on to the
time that the drive spindle reaches operating speed.
• Seek mode
During seek mode, the read/write actuator arm moves towar
d 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 100ms. This mode is not typical.
• Read/write
power and current
Read/write power is measured with the heads on track, ba
sed on three 63 sector read or write operations
every 100ms.
• 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 th
e drive is not spinning, and the servo and read/
write electronics are in power-down model
Table 4: DC power
Power dissipation +5V input average (25° C)
Spinup (max) 1A
Seek 1.3W
Read 1.25W
Write 1.65W
Idle, performance* 1.10W
Idle, active* 0.68W
Idle, low power mode* 0.47W
Standby** 0.12W
Sleep 0.12W
*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.
**Standby power is measured at steady state (after 200ms from transition)
