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Data storage device and data managing method

  • US 5,485,475 A
  • Filed: 08/31/1994
  • Issued: 01/16/1996
  • Est. Priority Date: 09/22/1993
  • Status: Expired due to Term
First Claim
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1. A data storage device comprising:

  • a plurality of data disks for storing data in units of data blocks;

    a parity disk for storing parity data used for restoring data to the data disks;

    first managing means for managing data blocks on the respective data disks with respect to whether each data block is used for data storage;

    second managing means for managing the data blocks on the respective data disks with respect to whether data of each data block is used for computing parity;

    detecting means, responsive to the first and second managing means, for detecting each data block which is not used for data storage and is used for computing parity; and

    purge processing means for updating the parity data based on data in the data blocks detected by the detecting means and the parity data stored to the parity disk corresponding to the detected data blocks.

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