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I have had a similar problem.

I'm a complete novice with linux, and have a three way setup with udf(2.0) dvds.
XT pc, Ubuntu PC and Panasonic dvd video recorder.

XT and dvd video udf disks are interchangeable with no problems.
A (preformatted at purchace) udf disk written to in XP will be accepted and written to in the dvd video recorder.
A (preformatted at purchace) udf disk written to by the dvd video recorder will be read ok and written to in XP.
The same goes for disks formatted to UDF20 in the dvd video recorder and XP (using udf tools).

However .. once linux gets involved by writing to the udf formatted disk, the disk is no longer readable in neither XP nor the dvd video recorder. As far as linux is concerned, everthing is ok. As far as everything else is concerned, linux has messed up the structure.

Any chance this can be resolved? .. or should udf disks be regarded as read only for linux?