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)


UNFORMAT d: [/J][/L][/test][/partn][/P][/U]

Purpose: Used to undo the effects of formatting a disk.


The UNFORMAT command is used to recover files on a disk that have been erased by using the FORMAT command.


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.


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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