Transducer head flying height monitoring methods and apparatus f

Details Transducer head flying height monitoring methods and apparatus f Transducer head flying height monitoring methods and apparatus f

1990-11-30

1992-12-01

Severin, David J.

Dynamic magnetic information storage or retrieval

Miscellaneous

360 75, G11B 560, G11B 2102

Patent

active

051684136

ABSTRACT:
A method and apparatus are provided for measuring flying height changes of a transducer head relative to a disk surface of a rotating disk in a disk file. A predetermined pattern is written on at least one predetermined region of the disk file. The predetermined region is normally not rewritten during operation of the disk file. At least one readback signal is sensed from at least one predetermined region of the disk surface. A plurality of sample values are identified corresponding to each readback signal. A change in the flying height is calculated utilizing the identified sample values. A frequency equalization number K can be utilized to calculate the magnitude and sign of the flying height change. Alternatively, real-time digital analysis of a predetermined pattern written on at least one predetermined region of the disk surface can be utilized to calculate the magnitude and sign of the flying height change.

REFERENCES:
patent: 4006294 (1977-02-01), Canino
patent: 4624564 (1986-11-01), Dahlgren
patent: 4777544 (1988-10-01), Brown et al.
patent: 4814907 (1989-03-01), Goor
patent: 4841389 (1989-06-01), Hoyt et al.
patent: 4843502 (1989-06-01), Tagawa
patent: 4853810 (1989-08-01), Pohl et al.
patent: 4866533 (1989-09-01), Nagashima
patent: 4954904 (1990-09-01), Goor
G. J. Kerwin, Insitu Measurement of Flyheight Variations in Magnetic Storage Devices through the Use of Sample Margin Signal Processing Techniques, Sep. 19, 1990, pp. 1-3.

Affiliated with

Also associated with

Rating

Transducer head flying height monitoring methods and apparatus f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Transducer head flying height monitoring methods and apparatus f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transducer head flying height monitoring methods and apparatus f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-506615