I have a image on a USB disk that I want to recover.
I've been trying a lot of free programs but when they recover the image, it can't be shown.
Is there some way I can byte recover this image or another way i can get this picture back?
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the guide is here
There are fewer freeware data recovery on Mac OS X than Windows. PhotoRec is definitely one that needs to be speak highly of. But it's a command line tool which may not be comfortable for general users. In your case, if the lost images lost from your USB is JPG format, you can also use Exif Untrasher (also freeware but few people know). Here is a review of those free ones on Mac OS X (truely freeware data recovery on Mac).
One more tip: if you can find a computer installed with Windows, things will be easier.
Disk Drill can help you to recover deleted image, but it's not free. http://download.cnet.com
Unfortunately the free version only scans and you need to buy the pro version to recover your deleted files.
After mistakenly letting a Verbatim Media Share Mini wreck two HFS+ drives, Disk Drill's thorough deep scan recovered all the media files lost from two drives. It was amazing.