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SEAGATE ENTERPRISE PERFORMANCE 15K HDD AND ENTERPRISE TURBO SSHD SAS PRODUCT MANUAL, REV. B 22
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 requirement s
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
.
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
+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.