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Seagate Enterprise Capacity 2.5 HDD v3 SAS Product Manual, Rev. D 25
6.3.1 Conducted noise immunity
Noise is specified as a periodic and random distribution of frequencies covering a defined frequency range. Maximum allowed noise values
given below are peak-to-peak measurements and apply at the drive power connector.
6.3.2 Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up and down.
6.3.3 Current profiles
The +12V and +5V current profiles for the Enterprise Capacity 2.5 HDD drives are shown below.
Figure 1. Current profiles for 2TB models
+5v = 250 mV pp from 100 Hz to 20 MHz.
+12v = 450 mV pp from 100 Hz to 100 KHz.
250 mV pp from 100 KHz to 20 MHz.
150 mV pp from 20 MHz to 80 MHz.