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Recording and readout using clock marks premastered by groove wobbling

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8 Author(s)
Fuji, Hiroshi ; Adv. Technol. Res. Labs., Sharp Corp., Nara, Japan ; Maeda, S. ; Murakami, Yoshiteru ; Mieda, M.
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A new recording and readout technique for land and groove recording on a magnetic super-resolution (MSR) disk is described. The technique uses specifically premastered clock marks. To generate a stable clock signal, the clock marks are fabricated with short bursts in grooves by wobbling at a different frequency from address information. The clock marks and the address information can be separated from a track error signal. When the extracted clock signal is applied to precise recording and readout of the magneto-optical data marks, the bit error rate becomes lower than that of the conventional clock recording/readout system. Additionally, the crosstalk of the wobbled address information to the magneto-optical signal can be canceled out electronically. This new format is not only suitable for high-density recording but also convenient in the disk manufacturing process

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Magnetics, IEEE Transactions on  (Volume:36 ,  Issue: 3 )