System for creating, reading and writing on rotatable informatio

Details System for creating, reading and writing on rotatable informatio System for creating, reading and writing on rotatable informatio

1998-02-13

2000-10-03

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

59 47, G11B 509

Patent

active

061282626

ABSTRACT:
In a system for writing a plurality of information tracks between adjacent portions of a reference track on a rotatable medium, advantage is taken of the fact that laser beam dithering a cross an edge of a reference track produces signals which are analyzable to determine much more exact radial positions. A pattern of bits is written on the medium with a known spacing between bits. This may be at the time of disk manufacture or later. As these bits are being read, a clock is started along with a bit counter. At this time, a precise determination is made of the radial position at which the read bits are present. From these values, angular and/or linear velocities are computed and stored on the medium. Collected over time, this information is useful for determining aging characteristics of the drive mechanism for the medium. Also, even one-time collection of this speed information is useful for determining the speed at which data was written so that the drive speed can be accurately controlled for read operations, for example.

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