Corrosion Test; Dc Power Requirements; Input Voltage; Power Supply Current (Typical) - Hitachi 7K400 - Deskstar Hard Drive Specifications

7.2.2 Corrosion test

The drive shows no sign of corrosion inside and outside of the hard disk assembly and is functional after being sub-
jected to seven days at 50°C with 90% relative humidity.

7.3 DC power requirements

Damage to the drive electronics may result if the power supple cable is connected or disconnected to the legacy
power connector while power is being applied to the drive (no hot plug/unplug is alloweed). If SATA power supply
cable is connected or disconnected to the SATA power connector, hot plug/unplug is allowed.

7.3.1 Input voltage

Table 47: Input voltage
Input voltage supply
+5 V
+12 V
1
To avoid damage to the drive electronics, power supply voltage spikes must not exceed specifications.
2
+12V should be applied within 60 seconds after +5V is applied to the drive.

7.3.2 Power supply current (typical)

Table 48: Power supply current of PATA model
Power supply current of PATA
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 1
Random R/W peak
Silent R/W average
Silent R/W peak
Start up (max)
Standby average
Sleep average
Except for a peak of less than 100 ms duration
1
Random seeks at 40% duty cycle
2
Seek duty = 30%, W/R duty = 45%, Idle duty = 25%
2
During run and spin up
5 V ± 5%
12 V + 10% –8%
+5 Volts [mA]
Pop Mean
350
230
200
220
200
220
560
1420
610
1420
1100
150
100
Deskstar 7K400 Hard Disk Drive Specification
Absolute max spike
voltage
–0.3 to 7 V
–0.3 to 15 V
+12 Volts [mA]
Std Dev Pop Mean
12 600
40 600
7 280
30 380
7 480
35 600
9 850
50 2100
9 660
50 1350
50 2000
9 20
8 20
51
Supply rise time
1
0 to 5 sec
0 to 5 sec
Total
[W]
Std Dev
12 9.0
20
10 4.4
20
13 6.8
20
20 13.0
50
15 11.0
40
75
3 1.0
3 0.7