Radiation Noise; Conductive Noise; Dc Power Requirements; Table 18: Magnetic Flux Density Limits - Hitachi HTS421212H9AT00 - Travelstar 120 GB Hard Drive Specifications

6.1.1.1 Corrosion test
The drive must be functional and show no signs of corrosion after being exposed to a temperature humidity stress
of 50°C/90% RH (relative humidity) for one week followed by a temperature and humidity drop to 25°C/40%RH
in 2 hours.

6.1.2 Radiation noise

The drive shall work without degradation of the soft error rate under the following magnetic flux density limits at
the enclosure surface.

Table 18: Magnetic flux density limits

Frequency (KHz)
0–60
61–100
101–200
201–400

6.1.3 Conductive noise

The disk drive shall work without soft error degradation in the frequency range from DC to 20 Mhz injected
through any two of the mounting screw holes of the drive when an AC current of up to 45 mA (p-p) is applied
through a 50-ohm resistor connected to any two mounting screw holes.

6.2 DC power requirements

Connection to the product should be made in a safety extra low voltage (SELV) circuits. The voltage specifications
are applied at the power connector of the drive.

Table 19: DC power requirements

Item
Nominal supply
Supply voltage
Power supply ripple (0–20 MHz)
2
Tolerance
Supply rise time
Watts (RMS typical)
Performance Idle average
Active Idle average
Low Power Idle average
4
Read average
Write average
Limits (uT RMS)
500
250
100
50
Requirements
+5Volt DC
–0.3 Volt to 6.0 Volt
1
100mV p-p max.
±5%
1 - 100 ms
3
Travelstar 4K120 Hard Disk Drive Specification
All models
1.25
0.65
0.45
1.4
1.4
27