IBM IC35L018UCDY10, Specifications

Page: 49 / 249

12.1 0.03 0.73 0.02 0.66 Random R/W average
n/a 0.10 2.12 0.10 1.40 Random R/W peak
n/a 0.13 2.12 0.03 1.07 Start up (max)
n/a 0.10 2.12 0.05 0.91 Seek peak
13.1 0.03 0.86 0.02 0.55 Seek average
n/a 0.10 0.40 0.02 0.22 Idle ripple (peak-to-peak)
7.0 0.03 0.37 0.02 0.50 Idle 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
11.1 0.03 0.64 0.02 0.66 Random R/W average
n/a 0.10 1.98 0.10 1.40 Random R/W peak
n/a 0.13 1.98 0.03 1.07 Start up (max)
n/a 0.10 1.96 0.05 0.91 Seek peak
12.0 0.03 0.77 0.02 0.55 Seek average
n/a 0.10 0.40 0.02 0.22 Idle ripple (peak-to-peak)
5.9 0.03 0.28 0.02 0.50 Idle 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
0-10 250 +12V DC
0-10 250 +5V DC
MHz Maximum (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
0.33 0.19 0.11 0.07
Power consumption efficiency
index- idle mode (W/GB)
18-GB Model 36-GB Model 73-GB Model 146-GB Model
Figure 35. Power consumption efficiency index
Ultrastar 146Z10 hard disk drive specifications
33