Embedded track information for patterned media

Dynamic magnetic information storage or retrieval – Modulating or demodulating

Reexamination Certificate

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Details

C360S048000, C360S135000, C428S848500

Reexamination Certificate

active

07835094

ABSTRACT:
A bit-patterned magnetic media (BPM) includes with respect to each data track regular bit-islands having a first size and large bit-islands having a second size. The placement of the regular bit-islands and large bit-islands within each data track results in a unique pattern. An amplitude-modulated readback signal is generated in response to a transducer head moving over the bit-patterned media. Based on the amplitude-modulated readback signal, channel response circuitry detects the pattern of regular bit-islands and large bit-islands associated with a particular data track. Based on the detected pattern, the channel response circuitry is able to uniquely identify the data track.

REFERENCES:
patent: 6977108 (2005-12-01), Hieda et al.
patent: 6999279 (2006-02-01), Lundstrom
patent: 7643235 (2010-01-01), Erden et al.
patent: 2003/0133213 (2003-07-01), Rubin et al.
patent: 2006/0126474 (2006-06-01), Hanks
patent: 2008/0002269 (2008-01-01), Sakurai et al.
patent: 2009/0067078 (2009-03-01), Min et al.

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