Seagate ST34573N/W/WD/LW/WC/LC Installation Manual page 21

Barracuda 9LP Installation Guide, Rev. E
Table 2c. DC power requirements (Amps), multimode
(SE/LVD)
Voltage
Regulation [5]
Max. operating current
DC [1]
Avg. idle current
DCX [1]
Max. starting current
(peak DC) [3]
(peak AC) [3]
Delayed motor
start (max) [1][4]
Peak operating current
Typical DCX [1] [6]
Maximum DC [1]
Maximum (peak)
[1] Measured with an average reading DC ammeter. Instanta-
neous +12V current peaks will exceed these values.
[2] A –10% droop is permissible during initial start of the spindle
but must return to ±5% before reaching 7,200 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 the +12V current profile in the Barracuda 9LP Product
Manual (publication number 77767517).
[4] This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
ST39173LW/LC
+5V +12V
±5% ±5%[2]
1.4 0.95
0.75 0.5
1.2 1.7
— 2.9
0.65 0.06
1.2 0.9
1.4 0.95
1.7 2.4
ST34573LW/LC
+5V +12V
±5% ±5%[2]
1.4 0.95
0.75 0.5
1.2 1.7
— 2.9
0.65 0.06
1.2 0.9
1.4 0.95
1.7 2.4
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