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DiamondMax 21 Serial ATA Product Manual, Rev. A
17
• 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 power-down mode.
Table 6: DC power requirements
*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.
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