Disk for measuring off-track quantity of magnetic head, and meas

Details Disk for measuring off-track quantity of magnetic head, and meas Disk for measuring off-track quantity of magnetic head, and meas

1983-09-28

1985-09-17

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 77, 360135, G11B 558, G11B 2336

Patent

active

045424284

ABSTRACT:
Burst-like data are alternately recorded on a disk over one round of tracks in directions of inner and outer circumferences with a track center of a desired track as a border. The burst-like data are arranged in such a manner that each data length of burst-like data is made shorter than a distance between a read.write gap of a magnetic head for reproducing the data and an erase gap, and that the distance among data of the burst-like data is made longer than a distance between the read.write gap and the erase gap. An apparatus for measuring the off-track of the magnetic head using the disk includes AC-DC converter to which reproducing signals of the magnetic head are supplied, reproduced DC signals being obtained from the AC-DC converter, A/D converter for converting the DC signals to obtain digital data, a timing generator for detecting the burst-like data and generating timing signals of data collection, an amplitude ratio calculation circuit for performing discrimination of the burst-like data provided at an inner or outer circumference side of the track and for detecting an amplitude ratio, and an amplitude ratio vs off-track quantity conversion circuit for converting the amplitude ratio to the off-track quantity of the magnetic head.

REFERENCES:
patent: 4084201 (1978-04-01), Hack et al.

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