Discrete track thin film magnetic recording disk with embedded s

Details Discrete track thin film magnetic recording disk with embedded s Discrete track thin film magnetic recording disk with embedded s

1988-04-28

1990-03-27

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

Disk

360131, G11B 582

Patent

active

049125850

ABSTRACT:
A discrete track thin film metal alloy or metal oxide magnetic recording disk has a plurality of angularly spaced sectors, each sector being formed of a plurality of discrete blocks of magnetic material which are magnetically polarized in the disk's circumferential direction. These discrete servo blocks and the discrete magnetic tracks are both formed at the same time during the fabrication of the thin film disk such that each servo block is precisely and permanently radially aligned with an associated discrete data track. Following the fabrication of the disk, each of the servo blocks is exposed to the magnetic field generated by passing a direct current (DC) through a recording head. In this manner each of the servo blocks becomes magnetized in the circumferential direction and thereby presents two discrete magnetic transitions to a servo read head or a read/write head.

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