YSmenu on Denetium 2 causes wipe out?

I have woodr4 1.04
and ysmenu (the latest version) (I made it executable)I tried running Denetium 2 on it and it froze my r4.
Next thing i know everything was gone (but i backed them up before)
Now it won't let me add anything, but says memory is full.
HELP.

Try formatting it. Right click the drive, and click format.