Recording apparatus, medium, method, and related computer...

Details Recording apparatus, medium, method, and related computer... Recording apparatus, medium, method, and related computer...

2007-09-11

2007-09-11

Moise, Emmanuel L. (Department: 2137)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

C726S026000

Reexamination Certificate

active

10187896

ABSTRACT:
A recording apparatus is provided for an SD memory card that has a plurality of EPUBxxx.KEY files recorded thereon, each file having a plurality of Key&Rule Entry areas, and an SD_EPUB.MMG file being read from the recording medium prior to the writing of data. A bitmap in SD_EPUB.MMG shows for each EPUBxxx.KEY file whether the EPUBxxx.KEY file has at least one Key&Rule Entry area not in use, or whether all the Key&Rule Entry areas are in use. Based on the bitmap in the read SD_EPUB.MMG file, the recording apparatus opens EPUB#u.KEY having an unused Key&Rule Entry area and writes data into the unused Key&Rule Entry area in the file. If all the Key&Rule Entry areas in EPUB#u.KEY become in use as a result of the writing of the data, the recording apparatus updates the bitmap in SD_EPUB.MMG.

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Copending U.S. Appl. No. 09/557,872, filed Apr. 24, 2000, entitled “Semiconductor Memory Card and Data Reading Apparatus”.

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