Seagate ST9146652SS ユーザーズマニュアル
Savvio 15K.2 SAS Product Manual, Rev. F
23
[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 7.2.1, "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:
73GB models
DC power requirements
Notes
3.0 Gbit mode
6.0 Gbit mode
(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
0.18
0.37
0.18
Maximum starting current
(peak DC) DC
3
σ
0.51
1.09
0.51
1.08
(peak AC) AC
3
σ
0.93
1.73
0.99
1.86
Delayed motor start (max) DC
3
σ
0.56
0.06
0.57
0.05
Peak operating current: (random read)
Typical DC
0.45
0.36
0.46
0.36
Maximum DC
3
σ
0.47
0.37
0.48
0.37
Maximum (peak) DC
3
σ
1.16
1.16
1.14
1.16
Peak operating current: (random write)
Typical DC
0.52
0.28
0.53
0.28
Maximum DC
3
σ
0.55
0.28
0.56
0.28
Maximum (peak) DC
3
σ
1.14
1.18
1.16
1.20
Peak operating current: (sequential read)
Typical DC
0.88
0.18
0.89
0.18
Maximum DC
3
σ
0.92
0.19
0.93
0.19
Maximum (peak) DC
3
σ
1.18
0.40
1.20
0.42
Peak operating current: (sequential write)
Typical DC
0.88
0.18
0.89
0.18
Maximum DC
3
σ
0.94
0.19
0.95
0.19
Maximum (peak) DC
3
σ
1.16
0.40
1.18
0.40