Abnormality detection of a recording medium in a magneto-optical

Details Abnormality detection of a recording medium in a magneto-optical Abnormality detection of a recording medium in a magneto-optical

1992-09-16

1994-08-23

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 13, 369 54, 369 58, G11B 1110, G11B 2736

Patent

active

053413598

ABSTRACT:
A magneto-optical recording and/or reading-out apparatus can record and read out information on and from a magneto-optical recording medium by the use of a laser beam. The apparatus includes a reflected beam detector, a comparator operatively coupled with the reflected beam detector, and a judgment unit operatively coupled with the comparator. The reflected beam detector detects the quantity of a laser beam reflected from the magneto-optical recording medium during recording. The comparator compares the quantity of the reflected laser beam with at least one reference value during the recording, thereby detecting an abnormality in the reflected laser beam. The judgment unit judges whether an area of the magneto-optical recording medium which has caused the abnormality is practically usable, in accordance with an output from the comparator and data to be recorded on this area.

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