The widely held theories of overwrite (OW) on thin film media predict very little sensitivity to the low frequency used in the measurement. Here experimental data is shown with a variation of more than 15 dB as the low frequency is changed from 1/2 to 1/14 of the high frequency pattern. Tang and Tsang's work (1993) on interpattern interactions is used to explain the sensitivity of OW to the specific frequencies used in the measurement.
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Fitzpatrick et al. (1996) studied this question.
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