Background Noise
Disk drive manufacturers have special problems when testing their drive
assemblies. One of these problems is background noise. A typical 21/2″
drive has a sound power level of about 40 dB. This means that in a
sound power test, where you typically measure one meter away from
the source, you are measuring a sound pressure level of about 30 dB.
Since background noise must be at least 6 dB, and preferably more than
10 dB, below the noise of the source, the only practical place to make
this test is within an anechoic or semi-anechoic chamber. And with the
next generation of drives, they are talking of typical sound power levels
of 30 dB instead of 40 dB.
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