Contents of the FAT.DOC file
FAT is a simple program that can be used to display the chain of
clusters (disk allocation units) that belong to a disk file, to
determine which file "owns" a specified cluster or sector,
and to display general information about a disk.
FAT is a passive program; that is, it does not perform any
functions that alter disk data. It is an inquiry program only.
NOTE: like CHKDSK, FAT may change the default drive and/or
directory while it is working. If the program is interrupted,
no harm will be done, but you may find that your drive/directory
has been changed.
Versions 1.08 and 1.09 correct problems with large disk
partitions under DOS 4.0. I think we've finally got it right
fat filespec [/D] [/H] [/I] (display chain)
fat [d:] /Cn [/D] [/H] [/I] (owner of cluster n)
fat [d:] /Sn [/D] [/H] [/I] (owner of sector n)
fat [d:] /I (disk info only)
/C Cluster owner
/D Decimal output
/H Hex output
/S Sector owner
The commands are detailed below.
Displaying the cluster chain for a file or directory
The syntax for this function is:
If only a path (and optional drive) is present, the chain of
clusters belonging to the subdirectory file itself is displayed.
If a filename is present, the chain of clusters belonging to the
named file is displayed. The filename may contain wildcards, in
which case the chain for all matching files will be displayed.
fat c:\dir ; Display chain for c:\dir itself,
; i.e., which clusters does the
; subdirectory file occupy.
fat c:\dir\file1.txt ; Display chain for file1.txt
fat c:\dir\*.* ; Display chain for all files
; in c:\dir
FAT interprets missing portions of the filename to be equivalent
to "*". Thus:
fat * == fat *.*
fat foo == fat foo.*
fat foo* == fat foo*.*
If you wish to display the chain for file "foo", but not
"foo.txt", use an explicit ".", as in:
Finding the owner of a cluster or sector
The syntax for this function is:
fat [d:] /Cn ; Find owner of cluster N
fat [d:] /Sn ; Find owner of sector N
fat /C160 ; Find owner of cluster 160
fat b: /C112H ; Find owner of cluster 112H
; on drive B.
fat /S14D ; Find owner of sector 014DH
See below for more information on how the input numbers are
interpreted (as decimal or hex).
You can append /I (Info) to any FAT command to display general
information about the selected disk. You can also run FAT with
only a /I parameter (and optional drive) to just display the
fat /I ; Info about default drive
fat B: /I ; Info about drive B
fat c:\foo/i ; Chain for foo, plus info
fat /i /c166 ; Owner of cluster 166H, plus info
Cluster and sector numbers for the /C and /S parameters are
assumed to be decimal, unless the numbers contain a hex digit
(A-F) or are suffixed with an 'H':
/c119 ; decimal
/s11A ; hex
/c116H ; hex
The output radix defaults to the input radix; that is, if your
sector or cluster is input in decimal, the output will be
displayed in decimal. Where there is no numeric input (for
example, "fat c:*.*"), decimal is assumed.
You can specify an explicit output radix by using the /H (hex)
or /D (decimal) switches:
fat /c116 /h ; Input decimal, output hex
fat /s12A /d ; Input hex, output decimal
fat c:*.sys ; No input, output decimal
fat c:*.sys /h ; No input, output hex
Output radix has no effect on the /Info display, which is mostly
Media types warning
FAT knows about certain media types (360K, 1.44M, fixed disks,
etc.). If FAT encounters a type about which it knows nothing,
it will continue to run but display a warning. If this warning
is displayed, the results may or may not be accurate (and in
fact, the program may or may not run to completion!). If the
results appear to be reasonable, they are probably accurate.
Versions prior to 1.06 would simply cancel when an unknown type
Version 1.09 - 01/16/90
Still fixing problems with large partitions
Version 1.08 - 01/08/90
Corrected some problems with large partitions
Version 1.07 - 12/18/89
Support for large partitions under DOS 4.0
Version 1.06 - 8/3/89
Support for media type F0
Allowed program to proceed with unknown media types
Version 1.05 - 6/13/88
Converted to Microsoft C
Fixed a problem with subdirectory names containing '.'
Versions 1.03/1.04 - 1/21/87 and 7/15/87
Fixed a few problems with 16-bit FATs
Version 1.02 - 9/13/86
First public release
This document and the program file FAT.EXE ("the software") are
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The software and documentation are:
Copyright (C) 1986, 1987, 1988, 1989, 1990 by
Christopher J. Dunford
The Cove Software Group
P.O. Box 1072
Columbia, Maryland 21044
CompuServe 76703,2002 [IBMNET]