Data compression/decompression and storage of compressed and uncompressed data on a same removable data storage medium
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United States of America Patent
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Feb 28, 1995
Grant Date -
N/A
app pub date -
Sep 11, 1992
filing date -
Sep 11, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
A data file having a plurality of data blocks is divided into one or more transfer units of data blocks. Before data storage, each transfer unit of data blocks is subjected to its own data compression cycle to create a group of compressed data blocks. The size of the data transfer unit, in bytes, is selected to facilitate addressing and retrieving individual recorded groups of compressed data blocks while providing good channel utilization and compression efficiency. Also the data transfer unit size is selected in part based upon data storage efficiency, i.e. the storage of the compressed data should fill as many addressable data storage areas as possible. Upon recording each group of compressed data bytes, an entry is made into a file directory for enabling addressing the recorded compressed data blocks.
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