| 摘要 |
An optical record carrier having an information track structure on a surface thereof, one or more of the tracks being pre-recorded with standard information pertaining to a particular class of information of common use to an undefined number of users. Portions of one or more tracks which are not so pre-recorded are covered with a layer of optically recordable material, for recording thereon of information of the aforesaid class which completes or updates the standard information in whole or in part.
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