Patent
1996-05-10
1998-07-14
Beausoliel, Jr., Robert W.
395621, G06F 1300, G06F 1200
Patent
active
057817227
ABSTRACT:
A diagnostic module (210) diagnoses defective compressed volume files (CVFs) stored on disks (200) in computer systems. A compressed file allocation table (CFAT) (206) has, for each CVF, an entry that indicates the starting sector of the cluster, the length, and flags indicative of whether the CVF is fragmented or compressed. Each entry in the CFAT (206) is checked, and, if an error is found, the error is recorded in an error table (214). A bit file allocation table (FAT) (202) is a data structure having a bit for each sector in the data region of a CVF. A bit of the bit FAT (202) is set by the diagnostic module (210) to indicate that the associated sector is being used by an entry in the CFAT (206). A repair module (212) is executed that repairs the entries in the CFAT (206) that have errors, typically by clearing the entry. The diagnostics module (210) is rerun and the bit FAT (202) is recreated. The bit FAT (202) is recorded on the disk (200). The operating system uses the recreated bit FAT (202) and the CFAT (206) during operation to track locations of data on the disk (200) and the sectors being used.
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Beausoliel, Jr. Robert W.
Symantec Corporation
Wright Norman M.
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