Hitachi IC25N040ATCS04-0 Specifications - Page 37

Radiation noise, 1.3 Conductive noise, 1.4 Magnetic fields - enclosure

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6.1.1.1 Corrosion test The hard disk 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 disk drive shall work without degradation of the soft error rate under the following magnetic flux density limits at the enclosure surface. Frequency (KHz) 0-60 61-100 101-200 201-400 Figure 19. Magnetic flux density limits Limits (Gauss RMS) 5 2.5 1 0.5 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. 6.1.4 Magnetic fields The disk drive will withstand radiation and conductive noise within the limits shown below. The test method is defined in the Noise Susceptibility Test Method specification, P/N 95F3944. Hitachi Travelstar 60GH & 40GN hard disk drive specifications 24

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6.1.1.1
Corrosion test
The hard disk 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 disk drive shall work without degradation of the soft error rate under the following magnetic flux
density limits at the enclosure surface.
0.5
201–400
1
101–200
2.5
61–100
5
0–60
Limits (Gauss RMS)
Frequency (KHz)
Figure 19. Magnetic flux density limits
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.
6.1.4 Magnetic fields
The disk drive will withstand radiation and conductive noise within the limits shown below.
The test
method is defined in the Noise Susceptibility Test Method specification, P/N 95F3944.
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
24