Seagate ST11950N/ND/W/WD manual 16 ST11950 and ST12550 Installation Guide, Rev. D, Amps

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 regulation5	± 5%	± 5%2	± 5%	± 5%2
Maximum operating current1		Amps
	1.1	0.95	1.5	0.95
Average idle current1, 12	0.76	0.83	0.79	0.83
Maximum starting current
Peak DC3, 6	1.0	2.18	1.1	2.18
Peak AC3	−	3.1	−	3.1
Delayed motor start (max)1, 4	1.06	0.19	1.1	0.2
Peak operating current
Typ DC1, 10	1.07	0.91	1.47	0.91
Max DC1	1.1	0.95	1.5	0.95
Max (peak)	1.15	1.87	1.8	1.86
Track following (DC)
at OD1	1.0	0.84	1.1	0.84
at ID1	1.0	0.9	1.1	0.9
Read track
OD DC1, 14	1.1	0.85	1.6	0.85
AC	1.2	1.2	1.8	1.2
Seeking
Typical DC1, 13	1.0	1.2	1.1	1.2
Maximum DC1	1.1	1.2	1.2	1.2
Maximum (peak) AC	1.2	1.8	1.7	1.8