Not sure what happened with a recording. Recorded a whole set put the card in my computer reader and there are no wav's there. I put the card back in the DR680 it shows two file names but I get an error "File Not Found In Take"
Is my data recoverable? Do I dare use this card again? It was brand new.
I'd say there's a good chance you could recover the recordings, but it's hard to say for certain. Lock the card and don't use it for anything else until you're able to recover files.
As for using the card again, once you've recovered the files (or given up), maybe try reformatting and trying some test recordings. The first time I recorded a show with a DR-08, something crashed before the end of the show, and I had to manually recover the (incomplete) recording. But after I reformatted the card it always worked fine after that.