Corrosion Test; Dc Power Requirements; Power Supply Current (Typical); Table 21.Input Voltage - Hitachi 7K250 - Deskstar - Hard Drive Specifications

6.2.2 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.

6.3 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.
6.3.1 Input voltage
Table 21: 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.

6.3.2 Power supply current (typical)

Table 22: Power supply current of xxx-GB models
Power supply current of
250-GB 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
Random R/W peak
2
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
2
During run and spin up
5 V ± 5%
12 V + 10% –8%
+5 Volts (mA)
Pop mean Std
dev
280 12
230 40
140 7
220 25
140 7
220 25
430 9
1252 50
470 9
1252 50
870 51
140 9
100 8
Deskstar 7K250 Hard Disk Drive Specification
Absolute max spike voltage
–0.3 to 7 V
–0.3 to 15 V
+12 Volts (mA)
Pop mean Std dev
470 12
330 20
180 10
270 20
350 13
240 20
660 14
1750 50
470 15
995 40
1840 75
20 3
20 3
29
1
Total (W)
7.0
2.9
4.9
10.1
8.0
0.9
0.7