This question is an exact duplicate of:
I hate itunes and so I usually use Windows7 to browse my Iphone4 and backup Videos and Photos. Yesterday I did just that.
I cut the videos and pasted on the D: drive. It ran out of space so I freed up some space and did cut and paste again. The result was 15 corrupted files and no files on the iphone.
I did this millions of times and it was always ok.
I've looked for recovering software but none seem to recognize the iphone. I went to an apple store and the dude obviously told me that the proper way to backup files is using itunes. He also mentioned that "there are some products out there that could do that for you. You should google it".
Does anyone know an app that can recover deleted files from an Iphone?