Digital alignment diagnostic disk

Details Digital alignment diagnostic disk Digital alignment diagnostic disk

1984-10-25

1986-08-26

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Record medium

Disk

360 75, 360 77, 360 25, 360 31, G11B 558, G11B 2110

Patent

active

046086188

ABSTRACT:
An alignment disk including data tracks written in a spiral configuration, through the use of microstepping techniques, to accurately test a variety of transducer head parameters including head alignment, resolution and offset. The tracks include standard spiral tracks, S-shaped clamping spiral tracks and bordered spiral tracks, comprising a sequence of discrete address blocks each containing unique identifying information. The spacing of each address block is precisely known and because each is separately identifiable transducer head location can be precisely ascertained. The microstepping technique may also be employed to create a copy protected disk for disk drives having half-track read and write capabilities.

REFERENCES:
patent: 3593331 (1971-07-01), Connell
patent: 3962724 (1976-06-01), Koizumi
patent: 4084201 (1978-04-01), Hack et al.
patent: 4149199 (1979-04-01), Chick et al.
patent: 4157577 (1979-06-01), Porter, Jr. et al.
patent: 4456938 (1984-06-01), Baasch et al.
patent: 4458275 (1984-07-01), Monti
patent: 4488187 (1984-12-01), Alaimo
patent: 4513331 (1985-04-01), Baker et al.
patent: 4513333 (1985-04-01), Young et al.

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