those chunks are either because the drive has failed or are the result of running a file recovery program like Recvua. did you run any sort of file recovery program?It seems as though the files have been broken down into the chunks, do you have any ideas of which software could do this? I might be able to download one of them and see if it can stitch the files back together?
either way, doesn't matter, your files are toast. (too late for the "how to backup" pearls of wisdom!)
you can try the software Mal suggested, but if the files are in chunks, you'll just get "this file is corrupted" when those programs try to open any files.
I've never seen software that could stitch files back together, but may that is due to never needing to look.
but I can't see how it would be possible.
a files first 'chunk' would have the file type in the header section, but any subsequent chunks would have no identifying indicators as to where they fit into a file let alone which file they belong to.