Recover Deleted Files Using the Free Open Source Tool PhotoRec
ubuverse.com
ubuverse.com
http://www.cgsecurity.org/wiki/PhotoRec_Step_By_Step
is actually more comprehensive.
which is provided - besides the licensed/commercial version - also in a free version with only minor limitations (and it exists for DOS, Linux and Windows).
Maybe the object of a next article?
Rest assured, and specifically I have used (besides Testdisk) both Photorec and DMDE extensively, that no tool is "perfect" and each tool may have some particular function that works where another tool doesn't, so when the game is "data recovery" the first rule is "throw (at the device) anything you can", beginning with one's tool of choice obviously, but without setting aside any other one.