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26 Cheetah 10K.7 SCSI Product Manual, Rev. D
[1] Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks
will exceed these values. Power supply at nominal voltage. Number of drives tested = 6, 35 Degrees C
ambient.
[2] For +12 V, a –10% tolerance is permissible during initial start of spindle, and must return to ±5% before
10,000 rpm is reached. 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 +12 V 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 Section 6.2.1 “Conducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,
and transient response.
[6] Operating condition is defined as random 8 block reads at:
257 I/Os per second (ST3300007) LVD
257 I/Os per second (ST3146707) LVD
256 I/Os per second (ST373207) LVD
Current and power specified at nominal voltages. Decreasing +5 volts by 5% increases 5 volt current by
<0.5%. Decreasing +12 volt supply by 5% increases 12 volt current by 1.4% (2% for ST3146707 and
ST373207 models).
[7] During idle, the drive heads are relocated every 60 seconds to a random location within the band from
Notes
ST3146707
SE mode LVD mode
Voltage +5 V +12 V +5 V +12 V
Regulation [5] ±5% ±5%[2] ±5% ±5%[2]
Average idle current DC X
[1][7] 0.54 0.42 0.54 0.42
Maximum starting current
(peak DC) DC
3σ
(peak AC) AC 3σ
[3]
[3]
0.77
1.09
1.89
3.66
0.76
1.06
1.89
3.83
Delayed motor start (max) DC
3σ [1][4] 0.54 0.06 0.54 0.06
Peak operating current
DC X
Maximum DC 3σ
Maximum (peak) DC 3σ
[1][6]
[1]
0.60
0.62
1.52
0.81
0.83
2.50
0.61
0.63
1.44
0.83
0.85
2.48
Notes
ST373207
SE mode LVD mode
Voltage +5 V +12 V +5 V +12 V
Regulation [5] ±5% ±5%[2] ±5% ±5%[2]
Average idle current DC X
[1][7] 0.54 0.34 0.54 0.34
Maximum starting current
(peak DC) DC
3σ
(peak AC) AC 3σ
[3]
[3]
0.76
1.08
1.55
3.04
0.77
1.03
1.56
3.36
Delayed motor start (max) DC
3σ [1][4] 0.54 0.06 0.54 0.06
Peak operating current
DC X
Maximum DC 3σ
Maximum (peak) DC 3σ
[1][6]
[1]
0.62
0.63
1.56
0.73
0.76
2.46
0.60
0.61
1.48
0.72
0.74
2.40