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CONSTELLATION ES.3 SAS PRODUCT MANUAL, REV. B 23
[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 7200 RPM. The ± 5% must be main-
tained 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 4TB models)
[4] This condition occurs after OOB and Speed Negotiation completes but before the drive has received the Notify Spinup primitive.
[5] See paragraph 6.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and 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.
Table 5 1TB drive DC power requirements
NOTES
3.0GB MODE 6.0GB MODE
(AMPS)(AMPS)(AMPS)(AMPS)
Voltage +5V +12V [2] +5V +12V [2]
Regulation [5] ± 5% [2] ± 5% [2]
Avg idle current DCX [1] [7] 0.34 0.27 0.32 0.27
Advanced idle current
Idle A
3s
0.31 0.27 0.32 0.27
Idle B
3s
0.23 0.24 0.23 0.24
Idle C
3s
0.23 0.16 0.24 0.16
Standby
3s
0.22 0.01 0.22 0.00
Maximum starting current
(peak DC) DC
3s [3]
0.59 2.19 0.58 2.18
(peak AC) AC
3s [3]
0.77 2.73 0.75 2.70
Delayed motor start (max) DC
3s [1] [4]
0.55 0.01 0.25 0.01
Peak operating current (random read):
Typical DCX [1] [6] 0.46 0.54 0.49 0.54
Maximum DC
3s
[1] 0.77 0.59 0.83 0.59
Maximum (peak) DC
3s
1.66 2.17 1.75 2.11
Peak operating current (random write)
Typical DCX
[1]
0.51 0.44 0.49 0.44
Maximum DC
3s [1]
0.83 0.48 0.83 0.48
Maximum (peak) DC
3s
1.04 2.07 1.05 2.10
Peak operating current (sequential read)
Typical DCX
[1]
0.72 0.31 0.69 0.31
Maximum DC
3s [1]
0.97 0.33 0.73 0.33
Maximum (peak) DC
3s
1.32 0.64 1.47 0.69
Peak operating current (sequential write)
Typical DCX
[1]
0.56 0.34 0.56 0.34
Maximum DC
3s [1]
0.58 0.36 0.58 0.36
Maximum (peak) DC
3s
0.94 1.89 0.74 1.21