Apparatus and method for determining a disk type prior to reprod

Details Apparatus and method for determining a disk type prior to reprod Apparatus and method for determining a disk type prior to reprod

1997-10-21

2000-06-06

Edun, Muhammad

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 369 47, G11B 700

Patent

active

060727578

ABSTRACT:
A type of disk in a reproducing device is accurately determined prior to data reproduction. To determine whether the disk type is Compact Disk (CD) or Digital Video Disk (DVD), a track pitch on the disk is examined, while the difference between the DVD Single Layer and DVD Dual layer is based on disk reflectance values. When thus determined disk type turns out to be incorrect, an operation is carried out for estimating the correct disk type based on the highest likelihood of the disk type following the initial (incorrect) decision. The process is carried out until the correct disk type is identified, or the disk is determined to be unusable.

REFERENCES:
patent: 5153879 (1992-10-01), Tanaka et al.
patent: 5289451 (1994-02-01), Ashinuma et al.
Patent Abstracts of Japan vol. 010, No. 137 (E-405), JP 60 264173 A (Hitachi Seisakusho KK), Dec. 27, 1985.

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