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Seagate Terascale HDD Product Manual, Rev. B 7
www.seagate.com
* 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.
• Spinup power
Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating
speed.
• Operating Read/Write power and current
Sequential read/write - 128 block transfer, QD=16, minimum 10 data points
Random read/write - 8 block transfer, QD=16, minimum 10 data points
Typical DC - average of average operating currents
Maximum DC - average of max operating currents
• Average Idle Current
Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in
a random track location.
• EPC Idle/Standby/Sleep mode
The current is measured in the desired EPC idle/standby state.
Table 2: 4TB Drive DC power requirements
6.0Gb mode
Voltage
+5V +12V
Regulation
±5% ±5%
Avg Idle Current *
0.27 0.27
Advanced Idle Current *
Idle_A 0.182 0.282
Idle_B 0.167 0.237
Idle_C 0.167 0.104
Standby 0.162 0.006
Average Sleep Current
0.162 0.006
Maximum Start Current
DC (peak DC) 3σ 0.34 0.51
AC (peak DC) 3σ 0.71 1.73
Peak operating current (random read):
Typical DC 0.29 0.42
Maximum DC 3σ 0.29 0.42
Peak operating current (random write)
Typical DC 0.29 0.42
Maximum DC 3σ 0.29 0.42
Peak operating current (sequential read)
Typical DC 0.48 0.30
Maximum DC 3σ 0.50 0.30
Peak operating current (sequential write)
Typical DC 0.40 0.32
Maximum DC 3σ 0.47 0.33