How do I restore my storage on a CD? The original size was 22.5GB but now it's at 18.8GB and there's noting on the CD?

I was using it as USB Drive storage but when I put the disc back into the rewrite disc and put files in there for storage it put it as "waiting to be burn" but it wasn't formatted into a DVD only a USB drive storage. So I re-formated it and now there's nothing in the CD but it's stuck at 18.8GB
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