Seagate BARRACUDA ST11950N/ND/W/WD User Manual
Page 19
ST11950 and ST12550 Installation Guide, Rev. D
17
DC power requirements
for ST11950W/WD and ST12550W/WD drives
Single-ended
Differential
+++++
5V
+++++
12V
+++++
5V
+++++
12V
Voltage regulation
5
±±±±±
5%
±±±±±
5%
2
±±±±±
5%
±±±±±
5%
2
Amps
Maximum operating current
1
1.04
0.95
1.3
0.95
Average idle current
1,
12
0.76
0.83
0.83
0.83
Maximum starting current
Peak DC
3,
6
1.0
2.18
1.1
2.18
Peak AC
3
−
3.1
−
3.1
Delayed motor start (max)
1,
4
1.0
0.19
1.1
0.19
Peak operating current
Typ DC
1,
10
1.03
0.91
1.21
0.91
Max DC
1
1.04
0.95
1.3
0.95
Max (peak)
1.2
1.87
2.0
1.87
Track following (DC)
at OD
1
1.0
0.84
1.1
0.84
at ID
1
1.0
0.9
1.1
0.9
Read track
OD DC
1,
15
1.1
0.85
1.4
0.85
AC
1.3
1.2
2.0
1.2
Seeking
Typical DC
1,
13
1.0
1.2
1.1
1.2
Maximum DC
1
1.1
1.2
1.2
1.2
Maximum (peak) AC
1.2
1.8
2.0
1.8
1
Measured with an average reading DC ammeter. Instanta-
neous
+
12V current peaks will exceed these values.
continued