Specifications

7.5 DC power requirements
The following voltage specification applies at the drive power connector. Connections to the drive should
be made in a safety extra low voltage (SELV) circuit. There is no special power on/off sequencing
required.
Adequate secondary over-current protection is the responsibility of the system. A limit of 10 A is required
for safety purposes.
7.5.1 Input voltage
0-400 ms15 V12 V ± 5% *+12 volts supply
0-200 ms5.5 V5 V ± 5%+5 volts supply
Supply rise time
Absolute max
spike voltage
During run and
spin up
Figure 30. Input voltage
* NOTE: –8% is acceptable during spin up, but the spin up time is not guaranteed.
CAUTION: To avoid damage to the drive electronics, power supply voltage spikes must not exceed
5.5 V.
7.5.2 Power supply current
Note: Seek power is at 50 IOPS and R/W power is at 30 IOPS with 4 KB R/W.
14.90.030.970.020.66Random R/W average
n/a0.102.400.101.40Random R/W peak
n/a0.132.400.031.07Start up (max)
n/a0.102.400.050.91Seek peak
16.00.031.100.020.55Seek average
n/a0.100.420.020.22Idle ripple (peak-to-peak)
10.20.030.640.020.50Idle Average
Total (W)
+12 Volts
Std. Dev
+12 Volts
Pop Mean
+5 Volts
Std. Dev
+5 Volts
Pop Mean
146-GB models
(All values in Amps.)
Figure 31. Power supply current of 146-GB models
12.80.030.790.020.66Random R/W average
n/a0.102.230.101.40Random R/W peak
n/a0.132.230.031.07Start up (max)
n/a0.102.230.050.91Seek peak
13.80.030.920.020.55Seek average
n/a0.100.400.020.22Idle ripple (peak-to-peak)
7.70.030.430.020.50Idle Average
Total (W)
+12 Volts
Std. Dev
+12 Volts
Pop Mean
+5 Volts
Std. Dev
+5 Volts
Pop Mean
73-GB models
(All values in Amps.)
Figure 32. Power supply current of 73-GB models
Ultrastar 146Z10 hard disk drive specifications
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