S
EAGATE
E
NTERPRISE
P
ERFORMANCE
15K HDD
V
5
AND
T
URBO
SSHD
V
2 P
RODUCT
M
ANUAL
, R
EV
. 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 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 instant5V 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.
