The description below is from the book DOS the Easy Way by Everett Murdock Ph.D.
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Type: External (5.0 and later)
Syntax:
UNFORMAT d: [/J][/L][/test][/partn][/P][/U]
Purpose: Used to undo the effects of formatting a disk.
Discussion
The UNFORMAT command is used to recover files on a disk that have been
erased by
using the FORMAT command.
NOTE:
The UNFORMAT command cannot always recover all the files that were on a
disk
that was accidentally formatted. To assure a better recovery of files on
a
formatted disk, use the MIRROR command.
Options
drive Specifies the drive containing the disk to unformat.
/J - Checks the disk to determine if the MIRROR command has been used
to place
file-recovery information on it. (In DOS Version 6, this program is
stored on
the DOS supplemental disk.)
/L - Used with the /partn parameter to tell DOS that there is no MIRROR
file
on the disk.
/P - Used to tell DOS to send any UNFORMAT messages to the printer.
/U - Used to tell DOS to recover files from a formatted disk without
using the
MIRROR file information (starting with DOS Version 6, this option is no
longer
available).
/partn - Used to restore a corrupted partition table of a hard disk
drive.
This option requires a PARTNSAV.FIL file created by using the MIRROR
command
with the /PARTN option (starting with DOS Version 6, this option is no
longer
available).
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