Klennet Storage Software

File formats to search for

Image settings

These settings apply to all supported image file formats.

Maximum reasonable image size

This controls initial guess for the image size. Get all your existing shots you took with the same camera, and look for a largest one. This will give you maximum actual image size. Then, select the lowest possible setting which is still larger than that maximum actual size.

This setting only affects carving time. The end result should still be the same, but correct setting will cut the run time by a couple of hours for a memory card.

Minimum image megapixel size

This setting only applies to fragmented files. Contiguous files below the megapixel threshold will be recovered. All fragmented files with the resolution below the threshold will be summarily dropped from the results. One case when it is really useful is when your high-megapixel camera stores low-resolution JPEG thumbnails in separate files alongside high resolution images. If you are only going after high-resolution images, set this to about 3 megapixels so that carver does not search for fragmented thumbnails. Doing so will cut the processing time somewhat, sometimes by up to 20%.

If you need a forensic recovery, leave this setting at zero.

ZIP settings

Maximum analysis time, per file

ZIP files can be big, and validating these big files takes a long time. Recovery time for ZIP files is proportional to the size of the file squared (known in programming as O(n2)). Therefore, it is quite easy to encounter a ZIP file which requires impractially long time to process. To prevent this, a cut-off time is imposed, that is, if ZIP file cannot be reconstructed within a given time, the attempt is aborted and the file is considered not recoverable.

This also applies to ZIP-based document files (MS Office DOCX, XLSX, PPTX); these are typically recovered in under a minute.