C
ONSTELLATION
ES.3 SAS P
RODUCT
M
ANUAL
, R
EV
. C
23
[1]
Measured with average reading DC ammeter. Instant12V 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
N
OTES
3.0G
B MODE
6.0G
B MODE
(A
MPS
)
(A
MPS
)
(A
MPS
)
(A
MPS
)
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
