Power Supply Current (Typical); Power Supply Generated Ripple At Drive Power Connector; Table 45.Power Supply Current Of 80Gb And 40Gb Models; Table 46.Power Supply Generated Ripple At Drive Power Connector - Hitachi 7K80 - Deskstar - Hard Drive Specifications

7.3.2 Power supply current (typical)

Table 45: Power supply current of 80GB and 40GB models
Power supply current of 40 GB
and 80 GB models(PATA)
(values in milliamps. RMS)
Idle average
Idle ripple (peak-to-peak)
Low RPM idle
Low RPM idle ripple
Unload idle average
Unload idle ripple
Random R/W average
Random R/W peak
Silent R/W average
Silent R/W peak
Start up (max)
Standby average
Sleep average

7.3.3 Power supply generated ripple at drive power connector

Table 46: Power supply generated ripple at drive power connector
Maximum (mV pp)
+5 V dc 100
+12 V dc 150
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.
+5 Volts [mA]
Pop Mean
275
230
160
220
160
220
1
490
1200
500
1200
840
150
100
MHz
0-10
0-10
Deskstar 7K80 Hard Disk Drive Specification
+12 Volts [mA]
Std Dev Pop Mean
14 275
40 290
6 140
20 250
6 270
20 400
7 600
30 1700
6 360
30 1000
50 1830
9 15
10 15
60
Total
[W]
Std Dev
24
4.7
20
7
2.5
20
6
4.0
20
12
9.7
50
8
6.8
40
50
2 0.9
2 0.7