Hello, my name is***** to Justanswer! Give me just a few minutes to look up some specifics, I'm working on this now.
Put the card into the recorder. Go to your menu, disk menu, select FORMAT. That should bring your card back to life.
Since it had one problem, I would suggest getting a new card, and don't use the one that malfunctioned for anything important, as it's likely to do it again.
Ok, this is going to be tricky... We're going to have to format the card, then use data recovery and hope for the best. I'm a musician as well, and know how frustrating it is to have a card go bad after you do all the work in the studio.
Put the card in your computer and perform a quick format. Don't do the full, just do the quick format so that it doesn't permanently wipe your data.
That program is what you want to use. Run it on the card, and save to your desktop. Don't save to the card, it will record over the data that you're trying to recover, and it will be a huge mess.
Cross your fingers, this doesn't always work, but if you are going to be able to recover the file, if it is recoverable, this will do it. The files may come up with funny names, and you may have to sift through the files to find what is what. It is not a quick process in most cases.
You would have to use the program with Windows.
But it's an awesome tool for recovering deleted files.