Storage of compressed data with algorithm
First Claim
1. A data storage method for storing compressed user data and associated information on tape comprising the steps of:
- accepting user data organized into a plurality of records;
compressing the user data according to a data compression (DC) algorithm;
writing the compressed user data to the tape, andwriting information indicative of the DC algorithm used to compress the user data to the tape.
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Accused Products
Abstract
The present invention provides a data storage method for storing compressed user data and associated information on magnetic tape. User data from a host computer is organized into a plurality of records. The user data is then compressed according to a compression algorithm. The compressed data and information related to the data compression (DC) algorithm are then stored on magnetic tape. The DC algorithm information pertains to at least one stored record of compressed data and is stored in a record header field. The DC algorithm information may provide for example, an algorithm number and/or an indicator for starting a data dictionary used for data compression and decompression. The user data may further be organized into groups having a group index for incorporating the DC algorithm information. The data records may be further organized into entities having at least one record. The DC algorithm information associated with an entity is incorporated into the group index of the group in which the entity of records is contained.
106 Citations
20 Claims
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1. A data storage method for storing compressed user data and associated information on tape comprising the steps of:
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accepting user data organized into a plurality of records; compressing the user data according to a data compression (DC) algorithm; writing the compressed user data to the tape, and writing information indicative of the DC algorithm used to compress the user data to the tape. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for storing compressed user data and associated information on tape comprising:
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interface means for accepting user data organized into a plurality of records; compression means for compressing the user data according to a data compression (DC) algorithm; first writing means for writing the compressed user data to the tape, and second writing means for writing information indicative of the DC algorithm used to compress the user data to the tape. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification