Seagate ST300MM0026 Savvio 10K.1 FC Product Manual - Page 32

I/Os per second ST973401FC at 2Gbit operation

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Table 3: DC power requirements for ST936701FC ST936701FC (at 1 Gbit) Notes (Amps) (Amps) ST936701FC (at 2 Gbit) (Amps) (Amps) Voltage +5V +12V [2] +5V +12V [2] Regulation [5] ±5% ±5% [2] ±5% ±5% [2] Avg idle current DCX [1] [7] 0.80 0.18 0.86 0.18 Maximum starting current (peak DC) DC 3σ [3] 0.88 1.83 0.94 1.82 (peak AC) AC 3σ [3] 1.00 2.92 1.06 2.84 Delayed motor start (max) DC 3σ [1] [4] 0.57 0.04 0.58 0.03 Peak operating current: Typical DCX [1] [6] 0.86 0.49 0.93 0.48 Maximum DC 3σ [1] 0.88 0.51 0.95 0.50 Maximum (peak) DC 3s 1.18 1.56 1.24 1.56 [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 10,000 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 2. [4] This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start Motor command. [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: 258 I/Os per second (ST973401FC at 1Gbit operation) 259 I/Os per second (ST973401FC at 2Gbit operation) 258 I/Os per second (ST936701FC at 1Gbit operation) 258 I/Os per second (ST936701FC at 1Gbit operation) [7] During idle, the drive heads are relocated every 60 seconds to a random location within the band from three-quarters to maximum track. General DC power requirement notes. 1. Minimum current loading for each supply voltage is not less than 1.2% of the maximum operating current shown. 2. The +5V and +12V supplies should employ separate ground returns. 3. Where power is provided to multiple drives from a common supply, careful consideration for individual drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak starting current must be available to each device. 4. Parameters, other than spindle start, are measured after a 10-minute warm up. 5. No terminator power. 26 Savvio FC Product Manual, Rev. D

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26
Savvio FC Product Manual, Rev. D
[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.
[2]
For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching
10,000 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 2.
[4]
This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start
Motor command.
[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:
258 I/Os per second (ST973401FC at 1Gbit operation)
259 I/Os per second (ST973401FC at 2Gbit operation)
258 I/Os per second (ST936701FC at 1Gbit operation)
258 I/Os per second (ST936701FC at 1Gbit operation)
[7]
During idle, the drive heads are relocated every 60 seconds to a random location within the band from
three-quarters to maximum track.
General DC power requirement notes.
1.
Minimum current loading for each supply voltage is not less than
1.2% of the maximum operating current
shown.
2.
The +5V and +12V supplies should employ separate ground returns.
3.
Where power is provided to multiple drives from a common supply, careful consideration for individual
drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak
starting current must be available to each device.
4.
Parameters, other than spindle start, are measured after a 10-minute warm up.
5.
No terminator power.
Table 3:
DC power requirements for ST936701FC
Notes
ST936701FC (at 1 Gbit)
ST936701FC (at 2 Gbit)
(Amps)
(Amps)
(Amps)
(Amps)
Voltage
+5V
+12V [2]
+5V
+12V [2]
Regulation
[5]
±5%
±5% [2]
±5%
±5% [2]
Avg idle current DCX
[1] [7]
0.80
0.18
0.86
0.18
Maximum starting current
(peak DC) DC
3
σ
[3]
0.88
1.83
0.94
1.82
(peak AC) AC
3
σ
[3]
1.00
2.92
1.06
2.84
Delayed motor start (max) DC
3
σ
[1] [4]
0.57
0.04
0.58
0.03
Peak operating current:
Typical DCX
[1] [6]
0.86
0.49
0.93
0.48
Maximum DC
3
σ
[1]
0.88
0.51
0.95
0.50
Maximum (peak) DC
3s
1.18
1.56
1.24
1.56