Seagate BARRACUDA ST11950N/ND/W/WD User Manual
Page 18
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16
ST11950 and ST12550 Installation Guide, Rev. D
DC power requirements
for ST11950N/ND and ST12550N/ND drives
Single-ended
Differential
+++++
5V
+++++
12V
+++++
5V
+++++
12V
Voltage regulation
5
±±±±±
5%
±±±±±
5%
2
±±±±±
5%
±±±±±
5%
2
Amps
Maximum operating current
1
1.1
0.95
1.5
0.95
Average idle current
1,
12
0.76
0.83
0.79
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
1.06
0.19
1.1
0.2
Peak operating current
Typ DC
1,
10
1.07
0.91
1.47
0.91
Max DC
1
1.1
0.95
1.5
0.95
Max (peak)
1.15
1.87
1.8
1.86
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,
14
1.1
0.85
1.6
0.85
AC
1.2
1.2
1.8
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
1.7
1.8
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