Efficient method and apparatus for access and storage of compres

Details Efficient method and apparatus for access and storage of compres Efficient method and apparatus for access and storage of compres

1992-06-29

1994-04-19

Pascal, Robert J.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 32, 341 55, 364DIG1, 360 722, G11B 1722

Patent

active

053052951

ABSTRACT:
Storage and access of compressed data via separately compressed and stored variable size logical blocks. Portions of an uncompressed data file are compressed until they reach a logical block size which matches a given sector size or block of storage space. Then that compressed logical block (portion of compressed data) is stored into a sector allocated to it and a table is built correlating the range of original compressed data to the sector storing the compressed data. In this way, data is compressed into a block size which matches the characteristics of the particular storage medium used. Thus the present invention efficiently stores compressed data by filling allocated sectors. When it is desired to read a given portion of data within a stored compressed data file, it is first determined where within the original data file the desired portion resided. Then, the table created as part of the compression and storage sequence is used to determine which sector contains the desired data. Thus, the direct access capability of compressed and stored data is maintained. Furthermore, because each block of data is separately compressed and stored, no other block needs to be retrieved in order to decompress and read the desired portion of data.

REFERENCES:
patent: 4467421 (1984-08-01), White
patent: 4782325 (1988-11-01), Jeppsson et al.

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