Seagate ST450MP0004 - 512N ユーザーズマニュアル
S
EAGATE
E
NTERPRISE
P
ERFORMANCE
15K HDD
AND
E
NTERPRISE
T
URBO
SSHD SAS 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 requirement
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
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.