Method and apparatus for correcting for systematic errors in...

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C360S075000

Reexamination Certificate

active

06898035

ABSTRACT:
Improvements in placement of timing patterns in self-servowriting include correcting for systematic errors due to geometric effects. A correction is made for varying systematic errors, such as when the recording head has spatially separate read and write elements. Further, servopattern rotation due to residual or unmeasured systematic errors is reduced by using a once per revolution clock index derived from the motor drive current waveform or any other sensor. In one aspect of correcting for systematic errors in the writing of timing patterns on a storage medium of a storage device, a time interval between a trigger pattern written at a first radial position of the storage medium and a rotational index is measured. The rotational index is related to the rotational orientation of the storage medium with respect to a fixed frame of the storage device. The location of another trigger pattern to be written is shifted, using the measured time interval to determine the shift in location for the another trigger pattern.

REFERENCES:
patent: 4414589 (1983-11-01), Oliver et al.
patent: 4879608 (1989-11-01), Sano
patent: 4912576 (1990-03-01), Janz
patent: 5229901 (1993-07-01), Mallary
patent: 5416652 (1995-05-01), Lewis
patent: 5448429 (1995-09-01), Cribbs et al.
patent: 5485322 (1996-01-01), Chainer et al.
patent: 5581420 (1996-12-01), Chainer et al.
patent: 5600501 (1997-02-01), Yamakoshi et al.
patent: 5612833 (1997-03-01), Yarmchuk et al.
patent: 5615058 (1997-03-01), Chainer et al.
patent: 5682274 (1997-10-01), Brown et al.
patent: 5694265 (1997-12-01), Kosugi et al.
patent: A-63 000872 (1988-01-01), None
patent: A-04 023276 (1992-01-01), None
patent: WO 9411864 (1994-05-01), None
“Regenerative Clock Technique For Servo Track Writers,” IBM Technical Disclosure Bulletin, Vo. 33, No. 5, p. 310-311, (Oct. 1990).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for correcting for systematic errors in... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for correcting for systematic errors in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for correcting for systematic errors in... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3373921

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.