Use of directory revision number to validate directory
First Claim
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1. A media drive including logic for determining the validity of a directory of a storage media device, the storage media device including a storage medium, the media drive comprising:
- a recording head to read or write the storage medium; and
validation logic operable to determine if the directory is valid by comparing a first directory revision number associated with the directory with a second directory revision number associated with a block on the storage medium.
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Abstract
An information storage medium such as a magnetic tape medium records a directory revision number as part of each block written to the medium (e.g., data block, ECC block, or information block). The directory revision number can determine if the directory that was read from the tape is valid for the block that was written with that directory revision number. The directory revision number may also be used to rebuild the directory.
62 Citations
22 Claims
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1. A media drive including logic for determining the validity of a directory of a storage media device, the storage media device including a storage medium, the media drive comprising:
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a recording head to read or write the storage medium; and
validation logic operable to determine if the directory is valid by comparing a first directory revision number associated with the directory with a second directory revision number associated with a block on the storage medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A media drive including validation logic operable to validate a directory of a storage media device, the storage media device including a storage medium, the media drive comprising:
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a recording head to read or write the storage medium;
validation logic operable to determine if the directory is valid by comparing a first directory revision number associated with the directory with a second directory revision number associated with a block on the storage medium; and
calculating logic operable to calculate a current correct directory revision number. - View Dependent Claims (11)
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12. A method of validating a directory of a storage media device, the storage media device including a storage medium, the method comprising:
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reading a first directory revision number from the directory;
reading a second directory revision number from a block on the medium; and
comparing the first and second directory revision numbers to determine whether the first directory revision number is the most recent directory revision number. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification