Method of rewriting information on a record medium by rewriting

Details Method of rewriting information on a record medium by rewriting Method of rewriting information on a record medium by rewriting

1993-05-10

1997-05-13

Black, Thomas G.

395438, G06F 1730

Patent

active

056301154

ABSTRACT:
In a method of rewriting a file data recorded on a record medium such as an optical memory card in successive tracks each constituting a minimum unit record, the file data is read out of the optical memory card as old records of an old file, the thus read out respective records of the old file are compared with corresponding records of a new file formed on a main memory disk to detect a revised record, and only the thus detected revised record is recorded on the record medium. On the main memory disk, there is further formed recording position information denoting a position on the record medium at which said revised record has been recorded and the thus formed recording position information is recorded on the record medium together with old and new file names. Only the revised record is recorded on the record medium, so that its data record area can be utilized optimally.

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Martin, Computer Data-Base Organization, 2nd Ed 1977, pp. 358-374, Prentice-Hall.

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