Need help recovering lost files

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http://www.linuxquestions.org – Hello, I need help desperately to recover lost files. This is what happened in a nutshell. I have an external hard drive that I used solely as a storage hard drive. The other day I tested a Linux a live distro by using USB creation program. I put a USB stick in the machine but due to my carelessness I didn't check everything and the program written the live CD on my external hard drive rather than on my USB stick. Now, I lost hundreds of my photographs some of which are irreplaceable. I'm experimenting with some program for days trying to recover the lost files without success. I tried “te (HowTos)