Doesn't recognize files on a DVD-R

Hello, everybody:)
I really hope you could help me with one issue.I have just added few files to my DVD-R (music, video, documents) via another computer using Nero. Now my Mac does not see those newly recorded files, only old ones, which were recorded in the same way in fact. My Fujitsu recognizes those new files though.. What can I do?
And another one, more general - when i insert DVD-RW and try to burn it, neither disk utility, nor toast allow me to create multi-session (and it worked once with CD-R).
Thank you in advance!!

Just to get this clear, you are saying that after burning a data DVD using Toast your Mac won't reognise the files?
Does that DVD show up up on your desktop when you insert it?
What brand of DVD media did you use?

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