Table 48. Power Supply Current Of Sata Model; Table 49. Power Supply Generated Ripple At Drive Power Connector - Hitachi HDS725050KLA360 Specifications

Table 48: Power supply current of SATA model
Power supply current of SATA
model
(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 2
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 49: 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 Std Dev
500
330
300
220
350
220
670
1600
710
1600
1190
280
220
MHz
0-10
0-10
Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
+12 Volts [mA]
Pop Mean
12 590
40 630
7 280
30 380
7 480
35 600
9 850
50 2100
9 660
50 1350
50 2000
9 20
8 20
53
Total
[W]
Std Dev
12
9.6
20
10
5.1
20
13
7.5
20
20
13.6
60
15
11.5
40
75
3 2.0
3 1.7