FreeDOS help system (hhstndrd 1.0.8 en)[undelete]

Command: undelete

UNDELETE attempts the recovery of deleted files.


undelete [directory] [options] directory The location where the file to be undeleted is. If no directory is given, the current working directory is assumed. There are also more advanced undelete options: undelete /action what destination [size]


/ALL Undelete ALL files in the given directory without prompting for each file. /LIST Lists files that can be undelete without prompting to undelete; no action is taken. /E Exports any undeleted files to an external disk and directory. With this option the source disk isn't modified. Possible [action]s: /syssave Saves the 1st or 2nd copy of the FAT, boot sector or root directory. Select fat1, fat2, boot, or root in [what]. /follow Looks for a (possibly deleted) file starting at the cluster [what] and saves data to a file given as [destination]. The output of DIRSAVE helps you to find the right cluster number. /dirsave Like FOLLOW, but saves a directory to a file. Directory [what] must be given by an absolute path starting with \ OR by a cluster number. Also shows a technical directory listing on the screen. destination must be on a drive other than the current drive. Data is always read/recovered from the drive from which undelete is invoked. size Specifying size is not needed, but you can override the autodetection by specifying size (in clusters for FOLLOW, in sectors for DIRSAVE).


UNDELETE only works on FAT12 / FAT16 disks! Using UNDELTE: 1. Finding undeleteable files and directories: Run undelete in DIRSAVE mode. You will see deleted directory entries specially marked, and you will see their cluster numbers on the screen. You can redirect screen output to a file, for example: undelete /DIRSAVE \ x:\rescued.dir >y:\logfile Where logfile will contain the screen output. If you have the FreeDOS utilites installed on your system, you could use something like one of the following instead: undelete /DIRSAVE \ x:\rescued.dir | TEE y:\logfile undelete /DIRSAVE \ x:\rescued.dir | TEE y:\logfile | MORE These will display the information on screen as well as store it in the logfile. 2. Recovering an undeleteable file Find the starting cluster of the file using DIRSAVE, as explained above. Then use FOLLOW on that cluster, for example: undelete FOLLOW 1234 x:\rescued.bin would save the contents of the deleted file starting on cluster 1234 to the file rescued.bin on drive x. Advanced Uses - Recovering from within deleted directories Run DIRSAVE on an existing directory to find the starting cluster of the deleted directory. Then run DIRSAVE on that cluster to find deleted files and directories within the deleted directory... and so on with successive cluster numbers as required. - Recovering partially overwritten files Use FOLLOW on the existing new files and override the size value (in clusters, undelete tells you how big a cluster on the current drive is when you start undelete). So, if you have accidentally overwritten a long file "OLD" with a short new file "NEW": * find the cluster number of "NEW" * give the size of "OLD" when using FOLLOW * The recovered output will begin with the contents of "NEW" but should contain the not-overwritten end of "OLD" as well, hopefully. - Using undelete to "mirror" important drive data If your filesystem gets completely broken, you can try to write back the important data saved by SYSSAVE. The saved information has to be stored on a separate disk. You may also wish to use the MIRROR command, which is simpler to use but stores the saved information at the end of the disk. * Run undelete in SYSSAVE mode for all 4 sources: fat1, fat2, boot, root * Keep the files in a safe place - Restoring the "mirror" data This may be necessary in some cases of disk disaster. WARNING: This is for experts, repair-men and very desperate people only! Doing this incorrectly or unnecessarily could make things worse! * Glue the 4 sources together in the order "boot fat1 fat2 root" to reconstruct the first part of your partition, starting with the first sector. * you could use DEBUG (w command) to restore this info * You can also merge saved and existing data with a hex editor.


- see comments -

See also:

debug del deltree erase format mirror more rd rmdir tee unformat ------------------------------------------------------------------------------ Copyright (C) 2003 Eric Auer, updated 2008 by W. Spiegl. This file is derived from the FreeDOS Spec Command HOWTO. See the file H2Cpying for copying conditions.