I'm about to try some freeware to recover some files from my Mackie SDR that just went missing, like 25 song's worth. Fortunately, I have everything backed up, but still curious as to why & how 25 project folders can't be called up on my internal drive. The application is PC File Inspector, here's the link:

http://www.snapfiles.com/download/dlpcinspector.html

It must have been an omen, someone on the Mackie forum posted this problem a few weeks ago and I saved the thread. A respondant referred him to this freeware, and it worked perfectly for him, all files recovered. Go get ya some!