Specifications

12.10.030.730.020.66Random R/W average
n/a0.102.120.101.40Random R/W peak
n/a0.132.120.031.07Start up (max)
n/a0.102.120.050.91Seek peak
13.10.030.860.020.55Seek average
n/a0.100.400.020.22Idle ripple (peak-to-peak)
7.00.030.370.020.50Idle Average
Total (W)
+12 Volts
Std. Dev
+12 Volts
Pop Mean
+5 Volts
Std. Dev
+5 Volts
Pop Mean
36-GB models
(All values in Amps.)
Figure 32. Power supply current of 36-GB models
11.10.030.640.020.66Random R/W average
n/a0.101.980.101.40Random R/W peak
n/a0.131.980.031.07Start up (max)
n/a0.101.960.050.91Seek peak
12.00.030.770.020.55Seek average
n/a0.100.400.020.22Idle ripple (peak-to-peak)
5.90.030.280.020.50Idle Average
Total (W)
+12 Volts
Std. Dev
+12 Volts
Pop Mean
+5 Volts
Std. Dev
+5 Volts
Pop Mean
18-GB models
(All values in Amps.)
Figure 33. Power supply current of 18-GB models
7.5.3 Ripple voltage
0-10250+12V DC
0-10250+5V DC
MHzMaximum (mV pp)
Figure 34. Power supply generated ripple at drive power connector
During drive start up and seeking 12-volt ripple is generated by the drive (referred to as dynamic loading).
If the power of several drives is daisy-chained, the power supply ripple plus other drive dynamic loading
must remain within the regulation tolerance of ±5%. A common supply with separate power leads to each
drive is a more desirable method of power distribution.
To prevent external electrical noise from interfering with the drive's performance, the drive must be held by
four screws in a user system frame which has no electrical level difference at the four screws position, and
has less than ±300 milivolts peak to peak level difference to the drive power connector ground.
7.5.4 Power consumption efficiency index
0.330.190.110.07
Power consumption efficiency
index- idle mode (W/GB)
18-GB Model36-GB Model73-GB Model146-GB Model
Figure 35. Power consumption efficiency index
Ultrastar 146Z10 hard disk drive specifications
33