Table 32 Power Supply Current Of 1 Disk Sata Models; Table 33 Power Supply Generated Ripple At Drive Power Connector - Hitachi CinemaStar P7K500 Specifications

Power supply current of
1 Disk SATA models
(values in milliamps. RMS)
Idle average
Idle ripple (peak-to-peak)
Low RPM Idle
Low RPM Idle Ripple
Unload Idle average
Unload Idle Ripple
1
Random R/W average
Random R/W peak
Start up (max)
Standby average
Sleep average

Table 32 Power supply current of 1 Disk SATA models

Except for a peak of less than 100
1
Random R/W : 40 IOPS / 16 Blocks Random Write and Random Read
5.5.3 Power supply generated ripple at drive power connector
+5V DC
+12V DC

Table 33 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 together, the power supply ripple plus the dynamic loading of
the other drives must remain within the above regulation tolerance. 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 performance of the drive, 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 millivolts peak to peak level difference to the ground of the drive power connector.
HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1)
+5 Volts [mA]
Pop Mean Std Dev
190 10
200 10
140 10
100 10
140 10
100 10
300 10
800 20
500 20
135 10
130 10
μ
s duration
Maximum (mV pp)
150
250
45
+12 Volts [mA]
Pop Mean Std Dev
220 15
300 20
110 15
250 20
210 15
300 20
410 15
1200 40
2000 50
5 5
5 5
MHz
0-10
0-10
Total
[W]
3.6
2.0
3.2
6.4
0.8
0.8