Why does Finder not see files on formatted DVD-RW?

I recently did a drag and drop of more than 90 text and pdf files onto a formatted DVD-RW.  The DVD now shows up as a blank disc.  I swear that I managed to add a couple of files and see them in Finder at least twice.  How do I get back into the files?  Disc was formatted for RW using Disc Utility which still sees the 1.7 GB of data on the disc in Info.  What happened? 

Thanks Lex:
I don't think Invisible will help.  Because I left the DVD-RW open after dragging and dropping files onto it there is no lead-out and the optical drive sees it only as a blank disc.  Somehow I got back into the disk before but since the last OS update 10.8.4 I am unable to get the disc to mount.  Seems I remember Bonjour finding and opening it once.  Nothing since.  Right now I'm leaning toward recreating the archive disc and then closing it as a data disc so I can mount it.  I recall doing this open RW in years past so I could continually add other files until the disc was full.  Protocols must have changed.  Bob Mehaffey

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