Seagate ST32171N/W/WC/WD/DC, ST32271N/W/WC/WD/DC, ST34371N/W/WC/WD/DC, ST34571N/W/WC/WD/DC Barracuda 4LP Product Manual

Barracuda 4LP Installation Guide, Rev. B 15
Table 2b. DC power requirements (Amps)
[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 4LP Product
Manual
(publication number 77767491).
[4] This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
ST32171/ST32271
N/W/WC
Single-ended WD/DC Differential
Voltage +5V +12V +5V +12V
Regulation [5] ±5% ±5%[2] ±5% ±5%[2]
Max. operating current
DC3σ [1] 0.81 0.85 1.21 0.85
Avg. idle current DCX [1] 0.46 0.52 0.70 0.52
Max. starting current
(peak DC) DC3σ [3]
(peak AC) AC3σ [3] 0.78 2.00 3.1 1.1 2.00 3.1
Delayed motor start (max)
DC3σ [1][4] 0.50 0.20 0.90 0.20
Peak operating current
Typical DCX [1][6]
Maximum DC3σ [1]
Maximum (peak) 3σ
0.72
0.81
1.5
0.73
0.85
2.3
0.91
1.21
2.0
0.73
0.85
2.3