Method and apparatus using slack area of file storage structures

Details Method and apparatus using slack area of file storage structures Method and apparatus using slack area of file storage structures

1996-01-24

1998-11-03

Black, Thomas G.

Data processing: database and file management or data structures

Database design

Data structure types

707200, 707202, 707206, 711173, 39518203, G06F 1730

Patent

active

058325263

ABSTRACT:
Available slack area in file storage structures is used for storing file-reconstruction data. The file-reconstruction data includes a unique end-of-file tag code (405) positioned within a vital core (403) section of limited length. The vital core section is located close to or against the end of the slack area. Less-essential file-reconstruction data is grown frontwards from the vital core section to the beginning of the slack area as room permits. During file recovery, the random access storage device (e.g., a disk whose directory structure has been damaged) is scanned for storage sub-areas (e.g., allocation blocks) containing the predefined, unique end-of-file tag code appropriately positioned within the vital core portion at the end of the sub-area. Each storage sub-area having such a properly-positioned end-of-file tag code is designated as a possible end-of-file sub-area. A file recovery program uses this and other available information to reconstruct the directory structure to whatever extent is made possible.

REFERENCES:
patent: 5313626 (1994-05-01), Jones et al.
patent: 5321824 (1994-06-01), Burke et al.
patent: 5347651 (1994-09-01), Burke et al.
patent: 5398142 (1995-03-01), Davy
patent: 5432928 (1995-07-01), Shermon
patent: 5473753 (1995-12-01), Wells et al.
patent: 5555405 (1996-09-01), Griesmer et al.
patent: 5561786 (1996-10-01), Morse

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