Two-pass defragmentation of compressed hard disk data with a sin

Details Two-pass defragmentation of compressed hard disk data with a sin Two-pass defragmentation of compressed hard disk data with a sin

1994-11-30

1996-11-12

Black, Thomas G.

Dynamic magnetic information storage or retrieval

Head

Core

395439, 360 48, 3642822, 3649624, 364DIG1, 364DIG2, G06F 1730

Patent

active

055749070

ABSTRACT:
A method and apparatus for defragmenting compressed file data stored on a disk. The method includes a first pass in which the FAT and MDFAT entries for each file stored on the disk are rearranged into adjacent clusters, but in which no movement of the compressed file data occurs. The method includes a second pass in which the actual compressed file data is rearranged on the disk in accordance with the FAT and MDFAT entries. A reference point is identified within the disk storage space such that no compressed file data will be stored beyond the reference point after the second pass is completed. During the rearrangement of data during the second pass, compressed file data is temporarily relocated beyond the reference point if possible. During all movements of compressed file data, the method transfers as much data as can be stored within the space to which the data is to be moved.

REFERENCES:
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patent: 5398142 (1995-03-01), Davy
McDonald et al., "Improving File System Performance by Dynamically Restructuring Disk Space", Eight InternationalPhoenix Conference on Computers and Communications, 22-24 Mar. 1989, Scottsdale Arizona, pp. 264-269.
Brett Glass, "DoubleSpace: DOS 6.0", InfoWorld, vol. 15, No. 37, Sep. 13, 1993, pp. 86-87.
Edward Mendelson, "Defragmenters and Multiboot: Organization or Complication", PC Magazine, vol. 12, No. 15, Sep. 14, 1993, pp. 154-156.
Christopher Barr, "Stacker 3.1 for Windows and DOS", PC Magazine, vol. 12, No. 15, Sep. 14, 1993, pp. 124-126.
Christopher Barr, "Microsoft DoubleSpace", PC Magazine, vol. 12, No. 15, Sep. 14, 1993, pp. 117-119.

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