Magnetic Fields; Figure 22. Magnetic Flux Density Limits; Radiation Noise; Conductive Noise - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

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
humidity drop to 25°C/40%RH in 2 hours.

6.1.2 Magnetic fields

The disk drive will withstand radiation and conductive noise within the limits shown below.

6.1.2.1 Radiation noise

The drive functions without experiencing degradation of the soft error rate under the following magnetic
flux density limits at the surface of the enclosure.
Frequency (KHz)
0–60
61–100
101–200
201–400

Figure 22. Magnetic flux density limits

6.1.2.2 Conductive noise

The disk drive functions without degradation of the soft error rate in the frequency range from DC to
20 MHz when current of up to 45 mA (p-p) is injected through any two of the mounting screw holes of
AC
the drive by means of a 50 Ω resistor.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
Limits (Gauss RMS)
5
2.5
1
0.5
26