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Seagate ST9900805SS Manuale Utente

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Savvio 10K.5 SAS Product Manual, Rev. D
25
[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.
[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. 
[3]
See +12V current profile in Figure 1 (for 900GB models) and Figure 2 (for 600GB models).
[4]
See +12V current profile in Figure 3 (for 450GB models) and Figure 4 (for 300GB models).
Table 5: 
300GB standard model 
DC power requirements
Notes
3.0Gb mode
6.0Gb mode
(Amps)
(Amps)
(Amps)
(Amps)
Voltage
+5V
+5V
Regulation
±5%
±5% [2]
±5%
Avg idle current DC
0.34
0.15
0.35
0.15
Advanced Idle Current
Idle_A
3
σ
0.37
0.16
0.38
0.16
Idle_B
3
σ
0.25
0.14
0.26
0.14
Idle_C
3
σ
0.25
0.08
0.26
0.08
Standby
3
σ
0.25
0.06
0.26
0.06
Transition Current
Idle_A
3
σ
0.99
1.52
1.02
1.55
Idle_B
3
σ
0.84
1.52
0.92
1.51
Idle_C
3
σ
0.85
1.46
0.84
1.53
Standby
3
σ
1.06
1.54
0.92
1.50
Maximum starting current
(peak DC) DC
3
σ
0.59
0.85
0.58
0.85
(peak AC) AC
3
σ
0.96
1.52
0.93
1.48
Delayed motor start (max) DC
3
σ
0.45
0.06
0.46
0.06
Peak operating current (random read):
     
Typical DC
0.46
0.43
0.46
0.43
Maximum DC
3
σ
0.49
0.45
0.50
0.46
Maximum (peak) DC
3
σ
1.25
1.47
1.27
1.51
Peak operating current (random write)
Typical DC
0.54
0.34
0.55
0.34
Maximum DC
3
σ
0.56
0.39
0.57
0.39
Maximum (peak) DC
3
σ
1.13
1.49
1.13
1.49
Peak operating current (sequential read)
Typical DC
0.80
0.17
0.80
0.16
Maximum DC
3
σ
0.90
0.18
0.90
0.18
Maximum (peak) DC
3
σ
1.13
0.34
1.20
0.33
Peak operating current (sequential write)
Typical DC
0.87
0.16
0.87
0.16
Maximum DC
3
σ
0.98
0.18
0.99
0.18
Maximum (peak) DC
3
σ
1.26
0.32
1.30
0.30