A novel pre-embossed rigid magnetic (PERM) disk using a 65mm-diameter molded plastic disk substrate has been developed. Runout characteristics of the plastic disk were investigated using a fast Fourier transform method and we found that the plastic disk had a low runout value of 3.0μm at a frequency of 120 Hz that was to be sufficient for a practical use. Magnetic and electromagnetic characteristics of a laminated CoCrPt/Cr magnetic film sputtered on the substrate surface were also evaluted experimentally and theoretically, and the recording capability of a bit density in excess of 400 Mbit/(inch)2 in the PERM disk was shown.
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Noda et al. (1993) studied this question.
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