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1985
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undel.doc
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1986-09-11
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UNDEL (Undelete) Steven Holzner
Command PC Magazine Vol 4, No 7
Copyright 1985 Ziff-Davis Publishing Company
______________________________________________________
Purpose: Recovers files on double-sided floppy disks
that have been accidentally deleted.
Format: UNDEL [d:]filename[.ext]
Remarks: Unless special measures are taken, DOS does
not overwrite the contents of a file when it
deletes the file. Rather, DOS simply changes
the first letter of the filename to E5 in its
directory table and unassigns the second (and
subsequent) clusters for the file from its
file allocation table. When no files have
been subsequently stored to disk that would
use the deallocated clusters, the deleted
file can usually be recovered intact by
UNDEL.COM.
As an aid to recovery of ASCII files, the
UNDEL command may be given as
UNDEL/A [d:]filename[.ext]
The /A parameter is designed to provide a
display of each proposed cluster to be
recovered before it is actually included in
the undeleted file. With late versions of
PC-DOS, however, the use of the /A parameter
has been found to return the error message,
"File Not Found Deleted". In such cases,
entering UNDEL without the added parameter is
normally sufficient to recover the complete
file without loss.
Notes:
1. UNDEL should not be used on 8-sector
disks (such as the distribution copy
of this disk), but only on 9-sector,
double-sided floppies.
2. Requires the use of DOS 2.0 or later,
but the command does not recognize
pathnames.