Klennet Storage Software

Klennet Carver vs. partially overwritten files

When files are just fragmented, Klennet Carver can reassemble them from the fragments to their original condition, or at least close enough to their original condition. Another situation is when one or several fragments are overwritten. Obviously, overwritten data cannot be recovered, but what about the remaining fragments?

First of all, if file header is overwritten, Klennet Carver cannot recover the file for there is no starting point to work with. This is a rare situation though. File headers are small, thousand times smaller then complete file, and probability of a header being overwritten is quite low.

If the file header is intact, what happens depends on file type:

  • For image files, the file is recovered up to the first overwritten fragment and then the recovery stops. Visually, the top part of the resulting image will be fine, followed possibly by a short burst of random colors, and the bottom part will be missing.
  • For video files, Klennet Carver recovers the file until it encounters the overwritten fragment. Then, either a stream of zeros or whetever happens to be on the media goes into the file until the next valid (non-overwritten) fragment. After the end of the overwritten fragment, recovery continues producing remaining valid data. The process is repeated if there are multiple overwritten fragments. Visually, this results in a video having dropouts or visually distorted fragments. Depending on the amount of data overwritten, quite long fragments may be missing, but as long as there is more data on the media, the video will continue after the end of overwritten fragment.