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View bigger - LOST.DIR Demo for Android screenshot
View bigger - LOST.DIR Demo for Android screenshot
View bigger - LOST.DIR Demo for Android screenshot
KitKat users see TROUBLESHOOTING below!

Lost Data? Suddenly, LOST.DIR contains lots of files? It had been empty all the time! These files have no extensions, and numbers as names? And there's no program which opens them?

This demo version shows how many files (and which file types) in LOST.DIR can be restored. Find the full version here: http://play.google.com/store/search?q=pub:hdop

Please note: "Restore" means to append extensions, according to the file type. The original file names cannot be restored!

How it works? Faulty file operations cause Android to try its best to save what can be saved: Blocks of data, which can no longer be assigned to the filesystem structure are not deleted, but saved in LOST.DIR, with numbers as file names.

IF YOU'RE LUCKY, these are complete (or truncated) files, whose types can be identified using the "magic number" contained in the first few bytes. After renaming an identified file - with the appropriate extension - it can be opened with the associated program.

So, these files can - at least partially - be restored. A restored file may even happen to be larger than the original file was, because the "files" in LOST.DIR always contain complete sectors. But most programs ignore "garbage" after end of file. Anyway, if no other backup is available, this is better than nothing...

This app automates the procedure described above. In settings you can select LOST.DIR, then all files without extension are analyzed and - if identified - renamed accordingly.

File types:
7z, aif, avi, bmp, bz2, doc, epub, exe, flv, gif, gz, html, jpg, m4a, mid, mkv, mod, mov, mp3, mp4, ogg, pdf, png, ps, rar, rm, swf, tif, txt, wav, xml, zip

Note: The restored files may be incomplete, damaged, or in any other way unusable.

If the external SD Card is for some reason not writable, renaming of files in LOST.DIR fails. In this case, copy the whole directory to the internal memory. The directory name must match exactly LOST.DIR. It's best to create a tmp directory and copy LOST.DIR into it. Then retry with the copy.

(More keywords: Data recovery, pictures and videos disappeared, recover lost files)

Recently changed in this version

- Troubleshooting: SD Card not writable

Comments and ratings for LOST.DIR Demo
  • (53 stars)

    by Brad Grigor on 23/04/2014

    I have both internal and external SD storage on my Galaxy Note. This program shows only the LOST.DIR on the external SD storage at first. The developer advised me to tap into the white field. A file browser appears. Then tap on the "../" entry to go up one directory. Repeat until sdcard0/ appears. Then drill down from there to find the internal LOST.DIR. Then it found 510 files. Thanks to Hans-D

  • (53 stars)

    by avinash meher on 01/04/2014


  • (53 stars)

    by Olumide Akomolafe on 02/02/2014

    Finds nothing

  • (53 stars)

    by abin shaju on 26/11/2013

    Make improvement..