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CLEARFAT.DOC
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1987-03-04
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CLEARFAT : Clear Disk File Allocation Table Program
Version 1.00, 04-Mar-1987
SMG Software
(C) Copyright 1987 by
Steven Georgiades
All Rights Reserved
This program enables the user to clear the file allocation table
of a specified disk. WARNING! This may cause loss of data! Never run
this program on a good disk. If you have crashed a disk, and CHKDSK
reports a large number of lost clusters and/or a "Probable non-DOS
disk" message, then your FAT is probably corrupted. Most disks have
two copies of the FAT, so you should try using the FATSWAP program
before you resort to using CLEARFAT. FATCOPY will copy the second copy
of the FAT over the first. If after this, CHKDSK still reports similar
errors, then both copies of the FAT are probably corrupted. If this is
the case, your best hope of recovering your data is to clear the FAT
and start from a clean slate. This procedure is as follows:
1). Run CLEANFAT on the crashed disk to zero out the FAT.
2). Delete all files on the crashed disk (DEL *.*).
3). Run an un-erase utility (such as Peter Norton's QuickUnerase).
This is necessary because un-erase files will not work properly if the
FAT of the crashed disk is corrupt. Note that if the boot sector of
the disk is also corrupted, then CLEANFAT will probably not behave
properly. If this is the case, use the program BOOTCOPY to copy the
boot record from a known good disk of the same format before trying
FATCOPY or CLEARFAT.
Command Format:
CLEARFAT [d:]
d: Optional drive letter. If this is omitted, the default
drive is used.
Examples:
CLEARFAT A: (Will clear the FAT of the diskette in drive A:)
CLEARFAT C: (Will give an error message if C: is a hard disk)
CLEARFAT (Will clear the FAT of the current disk, unless it
is a hard disk)
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This software is hereby released into the public domain, and may
therefore be freely copied and distributed within the following
restrictions:
1). It is distributed in its original, unmodified form, including
source code and documentation.
2). No fee is charged for use, copying or distribution.
3). The program may not be included with other goods or services
supplied for a fee, unless written permission to do so is
obtained in advance from the author.
This program is provided AS IS without any warranty, expressed or
implied, including but not limited to fitfulness for a particular
purpose.
If you have any questions or comments about this or any other SMG
program, write to me at the following address:
Steven M. Georgiades
SMG Software
701-H South Hayward Street
Anaheim, CA 92804
If you are using this program and find it of value, your contribution
in any amount ($5.00 suggested) will be greatly appreciated. Make
checks payable to Steven M. Georgiades.
Thank you.