Seagate Cheetah ST3450657SS Product Manual page 25
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Table 5 300 GB DC power requirements
Voltage
Regulation
Avg idle current
Maximum starting current
(peak DC) DC
(peak AC) AC
Delayed motor start (max) DC
Peak operating current (random read):
Typical DC
Maximum DC
Maximum DC (peak)
Peak operating current (random write):
Typical DC
Maximum DC
Maximum DC (peak)
Peak operating current (sequential read):
Typical DC
Maximum DC
Maximum DC (peak)
Peak operating current (sequential write):
Typical DC
Maximum DC
Maximum DC (peak)
[1]
Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous +12V current peaks will
exceed these values. 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 15,000 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.
[5] See paragraph 6.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and transient
response.
[6] Operating condition is defined as random 8 block reads at 375 I/Os per second for 600GB models, and 380 I/Os per
second for 450GB and 300GB models. Current and power specified at nominal voltages.
[7] During idle, the drive heads are relocated every 60 seconds to a random location within the band from three-quarters to
maximum track.
C
15K.7 SAS P
HEETAH
RODUCT
N
[5]
[1] [7]
3σ
[3]
3σ
[3]
3σ
[1] [4]
[1][6]
[1]
3σ
[1]
3σ
[1][6]
[1]
3σ
[1]
3σ
[1][6]
[1]
3σ
[1]
3σ
[1][6]
[1]
3σ
[1]
3σ
M
, R
. F
ANUAL
EV
3 G
BIT MODE
OTES
(A
)
(A
)
MPS
MPS
+5V
+12V [2]
±5%
±5% [2]
0.34
0.58
0.53
1.92
0.98
3.82
0.47
0.04
0.41
0.88
0.42
0.95
1.18
2.78
0.48
0.80
0.49
0.83
1.18
2.68
0.91
0.59
0.93
0.60
1.20
0.98
0.89
0.58
0.93
0.60
1.22
0.98
6 G
BIT MODE
(A
)
(A
)
MPS
MPS
+5V
+12V [2]
±5%
±5% [2]
0.35
0.58
0.54
1.92
0.86
3.98
0.48
0.04
0.42
0.90
0.43
0.95
1.20
2.74
0.49
0.81
0.51
0.82
1.20
2.66
0.92
0.59
0.94
0.61
1.24
1.00
0.90
0.59
0.94
0.60
1.22
0.96
20
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