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i got same problem with DVD+RW discs. Nautilus's default burner displays same dialogue before burning disc, but when I click on Erase disc it erases it. Same with growisofs -Z /dev/dvd -R -J /data_to_burn command. Just add that DVD+RW discs does not need to be really erased before reburning - that's what growiso actually does, it just burn over the data - it doesnt clean disc first.