Method of testing a worm type optical disk and system therefor

Details Method of testing a worm type optical disk and system therefor Method of testing a worm type optical disk and system therefor

1993-08-12

1995-07-18

Epps, Georgia Y.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, 369 32, G11B 700

Patent

active

054348374

ABSTRACT:
A medium testing method capable of testing a WORM (Write Once Read Memory) type optical disk efficiently and accurately, and a system for practicing the method. A playback unit plays back a disk to output a radio frequency (RF) signal representative of data stored therein. As the RF signal is routed through an RF amplifier to an error detecting unit, the detecting unit decodes the signal frame by frame and detects correctable errors and uncorrectable errors while correcting the errors of each frame. A track information detecting unit reads track information out of lead-in areas and outputs them. An error processing unit determines gaps between consecutive tracks by calculation on the basis of the track information. Subsequently, the error processing unit removes errors lying in the gaps from the error information received from the error detecting unit. Consequently, only the errors lying in the areas storing valid data, as distinguished from the gaps between tracks and gaps between sessions, are used to evaluate the disk. This allows only the substantial defects of the optical disk to be detected. The result of the test is written to an exclusive storage.

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patent: 5274617 (1993-12-01), Terashima et al.

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