We’ve made considerable effort to make sure we took accurate measurements of the noise and heat production levels of the harddisks tested. For the noise production, or rather sound pressure level, measurements we’ve used a professional sound pressure level meter costing several thousands of dollars and calibrated according to IEC-60651, Class-1. The actual measurements are in dB with an A-weighted curve to fit the sensitivity of the human ear, the maximum error is +/- 0.7dB. All of the given values are therefore in dB(A). All of the harddisks tested were mounted in a soundproof and fully insulated enclosure so as to make sure we measured the sound level generated by the harddisk and not the ambient noise. The microphone in all of these tests was at a distance of 25-cm or 10-inch from the top surface of the harddisk.
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