Quasi-constant linear-velocity disk having corresponding radii o

Details Quasi-constant linear-velocity disk having corresponding radii o Quasi-constant linear-velocity disk having corresponding radii o

1986-12-19

1989-04-04

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 59, 360 48, H04N 576

Patent

active

048192180

ABSTRACT:
A disk (magnetic, magneto-optical or optical) includes information-bearing tracks having prerecorded indicia, preferably tracking pads, distributed uniformly along each track for phase locking a write clock so as to write user data subsequently between the tracking pads, in the presence of random fluctuations in disk speed. The tracks are grouped into a plurality of annular zones encircling the center of the disk, wherein the ratio of the inner radius (or outer radius) of a given zone to the corresponding radius of the adjacent inner zone is a rational number, n/d, which is the same for each adjacent pair of zones. Each track within a given zone, i, has a fixed number of radially aligned tracking pads, P.sub.i, calculated from:

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