Seagate ST9450204SS Manual De Usuario
24
Savvio 10K.4 SAS Product Manual, Rev. E
[1]
Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these values.
Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.
Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.
[2]
For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching 9,936
RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been completed
and that the drive is able to accept selection by the host initiator.
RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been completed
and that the drive is able to accept selection by the host initiator.
[3]
See +12V current profile in Figure 17.
[4]
See +12V current profile in Figure 18.
[5]
This condition occurs after OOB and Speed Negotiation completes but before the drive has received the Notify
Spinup primitive.
Spinup primitive.
[6]
See paragraph 7.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and tran-
sient response.
sient response.
[7]
Operating condition is defined as random 8 block reads.
[8]
During idle, the drive heads are relocated every 30 seconds to a random location within the band from three-
quarters to maximum track
quarters to maximum track
.
Table 3:
450GB standard model
DC power requirements
Notes
450GB standard model
3.0Gb mode
450GB standard model
6.0Gb mode
(Amps)
(Amps)
(Amps)
(Amps)
Voltage
+5V
+12V [2]
+5V
+12V [2]
Regulation
±5%
±5% [2]
±5%
±5% [2]
Avg idle current DC
0.34
0.24
0.35
0.24
Advanced Idle Current
Idle_A
3
σ
0.34
0.24
0.35
0.24
Idle_B
3
σ
0.24
0.21
0.25
0.21
Idle_C
3
σ
0.24
0.10
0.25
0.10
Standby
3
σ
0.24
0.06
0.25
0.06
Maximum starting current
(peak DC) DC
3
σ
0.54
0.87
0.56
0.87
(peak AC) AC
3
σ
0.80
1.66
0.85
1.62
Delayed motor start (max) DC
3
σ
0.48
0.07
0.49
0.07
Peak operating current (random read):
Typical DC
0.44
0.53
0.46
0.53
Maximum DC
3
σ
0.47
0.54
0.48
0.54
Maximum (peak) DC
3
σ
1.08
1.54
1.08
1.54
Peak operating current (random write)
Typical DC
0.49
0.44
0.50
0.43
Maximum DC
3
σ
0.52
0.46
0.53
0.45
Maximum (peak) DC
3
σ
1.02
1.58
1.02
1.56
Peak operating current (sequential read)
Typical DC
0.86
0.27
0.87
0.27
Maximum DC
3
σ
0.88
0.29
0.89
0.28
Maximum (peak) DC
3
σ
1.12
0.44
1.14
0.44
Peak operating current (sequential write)
Typical DC
0.80
0.27
0.81
0.27
Maximum DC
3
σ
0.85
0.29
0.86
0.28
Maximum (peak) DC
3
σ
1.04
0.80
1.04
0.80