Conducted Noise Immunity; Power Sequencing; Current Profiles; Figure 1. Current Profile For 600Gb Models - Seagate ST300MP0004 Product Manual

General DC power requirement 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 requirements
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 instantaneous +5V and +12V current peaks in excess of the stated values
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.
+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.
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 Seagate Enterprise Performance 15K HDD drives are shown below.
Figure 1. Current profile for 600GB models
S E P
EAGATE NTERPRISE ERFORMANCE
15K HDD 4 T SSHD P
V AND URBO
M , R . C
RODUCT ANUAL EV
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