IBM IC35L036UWDY10 Hard Drive Specifications - Page 49

Ripple voltage, 5.4 Power consumption efficiency index, Total W, 12 Volts, Std. Dev, Pop Mean

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36-GB models (All values in Amps.) Idle Average Idle ripple (peak-to-peak) Seek average Seek peak Start up (max) Random R/W peak Random R/W average +5 Volts Pop Mean 0.50 0.22 0.55 0.91 1.07 1.40 0.66 +5 Volts Std. Dev 0.02 0.02 0.02 0.05 0.03 0.10 0.02 Figure 32. Power supply current of 36-GB models +12 Volts Pop Mean 0.37 0.40 0.86 2.12 2.12 2.12 0.73 +12 Volts Std. Dev 0.03 0.10 0.03 0.10 0.13 0.10 0.03 Total (W) 7.0 n/a 13.1 n/a n/a n/a 12.1 18-GB models (All values in Amps.) Idle Average Idle ripple (peak-to-peak) Seek average Seek peak Start up (max) Random R/W peak Random R/W average +5 Volts Pop Mean 0.50 0.22 0.55 0.91 1.07 1.40 0.66 +5 Volts Std. Dev 0.02 0.02 0.02 0.05 0.03 0.10 0.02 Figure 33. Power supply current of 18-GB models 7.5.3 Ripple voltage +12 Volts Pop Mean 0.28 0.40 0.77 1.96 1.98 1.98 0.64 +12 Volts Std. Dev 0.03 0.10 0.03 0.10 0.13 0.10 0.03 Total (W) 5.9 n/a 12.0 n/a n/a n/a 11.1 +5V DC +12V DC Maximum (mV pp) 250 250 MHz 0-10 0-10 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 146-GB Model 73-GB Model Power consumption efficiency index- idle mode (W/GB) 0.07 0.11 Figure 35. Power consumption efficiency index 36-GB Model 0.19 18-GB Model 0.33 Ultrastar 146Z10 hard disk drive specifications 33

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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