Interspersed phase-locked loop fields for data storage media...

Details Interspersed phase-locked loop fields for data storage media... Interspersed phase-locked loop fields for data storage media...

2011-06-28

2011-06-28

Negrón, Daniell L (Department: 2627)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

C360S048000

Reexamination Certificate

active

07969676

ABSTRACT:
Techniques are described for providing media-referenced timing for operations on a data storage medium. In particular, Phase-Locked Loop (PLL) synchronization fields may be interspersed within data fields of the medium and may be read to obtain timing measurements. The PLL fields are illustratively pre-recorded at predetermined intervals on the medium and have a fixed number of dots of the bit patterned medium between the PLL fields. Phase and frequency of a write clock may be controlled based on the read PLL fields to translate the timing measurements from the PLL fields into phase and frequency corrections to synchronize the write clock to the data storage medium.

REFERENCES:
patent: 7006316 (2006-02-01), Sargenti et al.
patent: 7643235 (2010-01-01), Erden et al.
patent: 2010/0128384 (2010-05-01), Shibano

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