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Chapter 9. Protecting Your Data > Recovering Deleted Files with UNDELETE

Recovering Deleted Files with UNDELETE

Because of the way DOS deletes files, reversing the process is relatively easy, but only if you act promptly. When DOS deletes a file, it changes the first character in the filename recorded in the directory area of the disk so that the target file no longer is listed. As far as DOS is concerned, the file is gone. DOS does not erase the filename entry completely, or overwrite any data in the file, until it needs the space for another file.

Eventually, as you add new files to the disk, DOS reallocates the disk space assigned to the deleted file, causing new data to overwrite the old data. Soon, the file and its data are gone permanently. But if you use the UNDELETE command before DOS has a chance to overwrite a deleted file's data, you can reverse the DELETE operation.


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