Hi, Don't know if it helps, but saved dmesg after pressig alt+printscreen+T Maybe it gives some additional information to trace the root of this weird behaviour. I has been produced on a different hardware with different DVD+/-RW unit. The kernel is the same (2.6.11-pre2) and the problem seems quite reproduceable on this box.vopied approx 1 gig to a newli formatted DVD +RW and the umount process never returned. Tried again with about 500M data and the results werw the same. Thanks, Attila