Seagate ST9146653SS ユーザーズマニュアル
Savvio 15K.3 SAS Product Manual, Rev. A
25
[1]
Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these val-
ues. Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.
ues. 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
15K 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.
15K 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 1.
[4]
This condition occurs after OOB and Speed Negotiation completes but before the drive has received the
Notify Spinup primitive.
Notify Spinup primitive.
[5]
See paragraph 7.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and
transient response.
transient response.
[6]
Operating condition is defined as random 8 block reads.
[7]
During idle, the drive heads are relocated every 60 seconds to a random location within the band from
three-quarters to maximum track.
three-quarters to maximum track.
Table 3:
146GB models
DC power requirements
Notes
3.0 Gb mode
6.0 Gb mode
Parameter
(Amps)
(Amps)
(Amps)
(Amps)
Voltage
+5V
+12V [2]
+5V
+12V [2]
Regulation
[5]
±5%
±5% [2]
±5%
±5% [2]
Avg idle current DC
[1] [7]
0.36
0.17
0.36
0.17
Standby
3
σ
0.28
0.05
0.27
0.04
Maximum starting current
(peak DC) DC
3
σ
0.67
0.86
0.67
0.86
(peak AC) AC
3
σ
0.91
1.74
1.01
1.60
Delayed motor start (max) DC
3
σ
0.56
0.06
0.56
0.06
Peak operating current: (random read)
Typical DC
0.50
0.41
0.48
0.42
Maximum DC
3
σ
0.52
0.42
0.50
0.43
Maximum (peak) DC
3
σ
1.37
1.25
1.29
1.24
Peak operating current: (random write)
Typical DC
0.59
0.32
0.57
0.33
Maximum DC
3
σ
0.61
0.34
0.58
0.34
Maximum (peak) DC
3
σ
1.20
1.27
1.12
1.25
Peak operating current: (sequential read)
Typical DC
0.87
0.18
0.84
0.19
Maximum DC
3
σ
0.93
0.18
0.90
0.19
Maximum (peak) DC
3
σ
1.22
0.43
1.21
0.41
Peak operating current: (sequential write)
Typical DC
1.00
0.18
0.98
0.19
Maximum DC
3
σ
1.06
0.18
1.03
0.19
Maximum (peak) DC
3
σ
1.32
0.36
1.34
0.36