I have been periodically burning new files to a set of DVD+R's. I formatted them all for the live file system in Vista which allows such additions. Just now I burned a new file to one of them but for some reason the mastered formatting must have been switched on. The result is the disc now appears blank. No files are visible. Under properties, though, it is mostly full. Is there any way to recover those files? They are obviously still taking up space on the disc. Thanks in advance.