Abstract
A generalized analysis has been presented for describing the influence of overwrite (or reverse overwrite) interferences on the spectra of readback signal, which extends the previous theory in describing the spectra characteristics caused by the hard–easy transition shift. Interestingly, it also suggests that the residual signal from the overwritten data pattern could be periodic as well. Essentially, an imprint effect arising from old data pattern could also create an amplitude-modulated signal that generates sidebands around the fundamental and odd harmonics of the overwriting signal.
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