Mac – How to recover deleted files in Mac OS X

There's nothing reliable. extundelete runs through the raw filesystem, and restores things that look like files to a recovered file directory. It's for ext3, but its creators claim some success with ext4.

The risk is that your file gets overwritten by later writes, so that there is nothing to recover. Or that the program is defated by some quirk of ext4fs.

Recuva is a freeware Windows utility to restore files that have been accidentally deleted from your computer. This includes files emptied from the Recycle bin as well as images and other files that have been deleted from other locations also.

You may also try Undelete360 which is a simple file recovery program that can undelete files that have recently been deleted by accident. There is also a portable version available, in case if you don't want to install any software in your PC.