Method for recording indicia for indicating presence or absence

Details Method for recording indicia for indicating presence or absence Method for recording indicia for indicating presence or absence

1987-09-17

1989-10-03

McElheny, Jr., Donald

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369275, G11B 700

Patent

active

048721549

ABSTRACT:
There is disclosed an information record method comprising the steps of recording information in one record area of an information record medium having a plurality of record areas, reproducing the recorded information and checking error thereof, and recording an indicia indicating absence of error at a portion of the record area in accordance with an error check result. An information record apparatus used for the above method comprises a device for recording information on an information record medium having a plurality of record areas, a device for moving the record device to a record area to which information is to be recorded, a device for reproducing the information recorded in the record area, a device for checking error based on the reproduced information, and a device for recording an indicia for indicating absence of error at a portion of the record area in accordance with error check result.

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