Preformat method for magnetic recording medium, magnetic...

Details Preformat method for magnetic recording medium, magnetic... Preformat method for magnetic recording medium, magnetic...

2007-04-10

2007-04-10

Young, Wayne (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

C360S051000, C360S075000, C360S017000

Reexamination Certificate

active

10632293

ABSTRACT:
The magnetic recording and reproducing apparatus reads a transfer clock synchronized with servo information and records a write-once clock pattern in a state where 0 is set as a delay time of the delay device13and 1 is set as the dividing ratio of the frequency divider17. The apparatus corrects the delay time according to the output of the phase comparator14which changes on the basis of the phase difference and rewrites a write-once clock pattern. Rotation of the magnetic disk, detection of the phase difference and correction of the delay time are repeatedly preformed until no change occurs in the output of the phase comparator14. After the output stops changing, preformat information patterns excluding the servo information pattern are recorded as fine patterns by changing the dividing ratio of the frequency divider17to multiply the frequency.

REFERENCES:
patent: 4748611 (1988-05-01), Tsuyoshi et al.
patent: 5539723 (1996-07-01), Hoshino et al.
patent: 5680267 (1997-10-01), Tanaka et al.
patent: 6084731 (2000-07-01), Uchida et al.
patent: 6381292 (2002-04-01), Yamakoshi
patent: 6466385 (2002-10-01), Umeda et al.
patent: 6529341 (2003-03-01), Ishida et al.
patent: 6738205 (2004-05-01), Moran et al.
patent: 6738215 (2004-05-01), Yatsu
patent: 2002/0135927 (2002-09-01), Yatsu
patent: 2004/0075935 (2004-04-01), Yatsu
patent: 2523316 (1996-05-01), None
patent: 62523316 (1996-05-01), None
patent: 10-269566 (1998-10-01), None
patent: 2001-134936 (2001-05-01), None
patent: 2001-243733 (2001-09-01), None

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