DiamondMax 21 Serial ATA Product Manual, Rev. A
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• Operating power and current
Operating power is measured using 40 percent random seeks, 40 per cent r ead/ wri te m ode (1 w rite 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 ac tive 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 power-down mode.
Table 6: DC power requirements
*During periods of drive idle, some off lin e a cti vit y ma y oc cu r acc ord ing t o the S.M.A.R.T. specification, which may inc r ease ac ou sti c an d
power to operational levels.
2.8.1.1 Typical current profiles
Figure 1. Typical 5V startup and operation current profile
Power dissipation Avg (watts 25° C) Avg 5V typ amps Avg 12V typ amps
Spinup — — 2.8 (peak)
Idle* 9.30 0.611 0.520
Idle* (with offline activity) 10.40 0.719 0.567
Operating (40% r/w, 40% seek, 20% inop.) 13.00 0.772 0.762
Seeking (random, 20% idle) 12.60 0.613 0.795
Standby 0.80 0.106 0.023
Sleep 0.80 0.106 0.023