Method and apparatus for providing read and write skew offset in

Details Method and apparatus for providing read and write skew offset in Method and apparatus for providing read and write skew offset in

1996-05-01

1999-12-28

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, 360 48, G11B 5596

Patent

active

060089628

ABSTRACT:
The present invention is a method and apparatus for generating a skew or position offset signal for aligning the read element of an MR head with the centerline of written data, during a read operation. The disk has a plurality of tracks, one of which contains a calibration burst that allow the read element to be centered with the centerline of written data. This is accomplished by first writing the calibration burst on a predetermined number of sectors of the track. A profile of the calibration burst is obtained by micro-jogging the head from a first position that is -50% from the track centerline to a second position that is +50% of the track centerline, and sensing the magnitude of the calibration burst in various increments between the first and the second positions. For each microjogging position, the magnitude of the calibration burst is obtained. The microjogging position corresponding to the peak value of the calibration burst represents the offset between the read and the write elements. The offset signal is stored in memory and used in a servo routine to center the MR head during a read operation. The calibration burst may be included in a single track, a predetermined number of tracks, or on every track of the disk.

REFERENCES:
patent: 4890172 (1989-12-01), Watt et al.
patent: 5053899 (1991-10-01), Okawa et al.
patent: 5210662 (1993-05-01), Nishijima
patent: 5408367 (1995-04-01), Emo
patent: 5500776 (1996-03-01), Smith
patent: 5523902 (1996-06-01), Pederson
patent: 5587850 (1996-12-01), Ton-that
patent: 5608587 (1997-03-01), Smith
patent: 5659436 (1997-08-01), Yarmchuk et al.
patent: 5680270 (1997-10-01), Nakamura
patent: 5691857 (1997-11-01), Fitzpatrick et al.

Affiliated with

Also associated with

Rating

Method and apparatus for providing read and write skew offset 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 providing read and write skew offset in, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for providing read and write skew offset in will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2386490