Test disk having defect patterns uniformly distributed in record

Details Test disk having defect patterns uniformly distributed in record Test disk having defect patterns uniformly distributed in record

1994-07-26

1996-06-11

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, G11B 700

Patent

active

055263410

ABSTRACT:
A test disk having defect patterns uniformly arranged in recording areas is produced by a production method including: producing a stamper having a plurality of data pits in accordance with test data signals recorded on the test disk; radiating laser light to the stamper by using a laser system so that a plurality of small patterns are produced at laser-light exposed portions along first lines on the stamper, to form interruptions, which interrupt the data pits on the stamper, in accordance with the small patterns; and performing injection molding with plastic material to produce a disk based on the stamper, so that the disk has interruptions corresponding to the interruptions of the stamper, and the interruptions of the disk are included in a recording layer of the disk.

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