TestDisk & PhotoRec: Rescuing Deleted Files On Windows, Linux, Mac OS X, And Other OS's

TestDisk is a free (open source) software that let you recovered deleted partitions and files on most major operating systems easily. I've used it successfully on Windows, Linux, and Mac OS X on various occasions. So, if you unintentionally delete your files you might want to try it.

For deleted files on digital camera memory, TestDisk has a companion program called PhotoRec that recovers pictures and videos from the various media such hard disks, DVD, CD, memory cards, and thumb drives. Here's a step-by-step guide on how to use it.