This is what happened. I thought I had back up files for those that were in the HD so I allowed time machine to reformat it from a FAT32 to an HFSX, and back up the computer. I know mine may be a hopeless case, but I want to know if there's a program that allows me to scan the unallocated space and see if my old files are still there. So far I've used programs that seem to be only recovering the ones that are currently in the HD. Or does this mean that my files have likely been overwritten? Please, I need help.