While we could just point to the results of using this undelete program and call it magic, there is an underlying reason that allows Disk Drill to recover deleted files. It can even be used to recover deleted files that have been emptied from your Recycle Bin. Let’s see how this is accomplished.
In a manner similar to most modern operating systems, Windows does not permanently physically delete files from your hard drive when they are logically deleted. The OS marks the space previously occupied by the deleted file as being available for reuse. Until this space has been fully used and overwritten with another file, the original deleted file can be recovered.
For this reason, you should minimize disk use as much as possible as soon as you notice data loss. This will give you the best chance of eventually recovering the files without having them overwritten in the interim. Depending on the level of disk usage, file fragments sufficient to allow Disk Drill to enact a recovery can remain for a considerable amount of time.