Method and apparatus for testing characteristics of a floppy dis

Details Method and apparatus for testing characteristics of a floppy dis Method and apparatus for testing characteristics of a floppy dis

1988-06-08

1990-02-27

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360 31, 360 7702, 369 53, G01R 3312, G11B 2736, G11B 556

Patent

active

049049380

ABSTRACT:
Method and apparatus for determining the alignment of a data track on a magnetic disc, for example a floppy disc and for determining the alignment of a read/write head in disc drive writing apparatus. In the method the radius of the circumferential center line of the track is determined by determining the radius of the peak value of the transverse envelope of the signal on the data track. The peak value is determined by computing the track average amplitude at a number of incremental positions transversely across the data track. The peak value and its radial position is then computed using a parabolic curve fitting technique.

REFERENCES:
patent: 4499572 (1985-02-01), Yoshikawa et al.
patent: 4611249 (1986-09-01), McClure
Bowen et al, Measuring Gap Length in Magnetic Recording Heads, IBM Tech. Discl. Bull., vol. 20, No. 10, Mar. 1978, pp. 4059, 4060.

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