Radiation Noise; Table 14: Magnetic Flux Density Limits - Hitachi IC25N040ATMR04-0 - Travelstar 40GB Laptop Hard Drive 9.5mm 2.5 Inch Notebook HDD Specifications

100
90
80
70
60
50
40
30
20
10
0
-45
Figure 1: Limits of temperature and humidity
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 14: Magnetic flux density limits

Frequency (KHz)
0–60
Specification (Environment)
Non Operating
-35 -25 -15
Limits (uT RMS)
500
Travelstar 80GN Hard Disk Drive Specification
31'C/90%
Operating
-5 5 15 25
Temperature (degC)
26
41'C/95%
WetBulb 40'C
WetBulb29.4'C
65'C/23%
55'C/15%
35 45 55 65