Seagate Enterprise Performance 10K HDD v9 Product Manual, Rev. D (Draft 2)
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General DC power consumption notes.
1.
Minimum current loading for each supply voltage is not less than 1.7% of the maximum operating current shown.
2.
The +5V and +12V supplies should employ separate ground returns.
3.
Where power is provided to multiple drives from a common supply, careful consideration for individual drive power
consumption should be noted. Where multiple units are powered on simultaneously, the peak starting current must
be available to each device.
4.
Parameters, other than spindle start, are measured after a 10-minute warm up.
5.
Drive background activity can cause instant5V and +12V current peaks in excess of the stated values.
6.4.1
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.
6.4.2
Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up and down.
6.4.3
Current profiles
The +12V and +5V current profiles for the Enterprise Performance 10K HDD drives are shown below.
Figure 1.
Current profiles for 2400GB 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.
