This article is from the CD-Recordable FAQ, by Andy McFadden (email@example.com) with numerous contributions by others.
The UDF filesystem is based on the ISO/IEC 13346 standard, now ECMA-167,
and remains compliant to that standard. Anything that knows how to read
discs conforming to ISO-13346 should be able to read UDF discs.
When some Windows owners have inserted an older disc written with UDF
(using one of the drag-and-drop approaches like DirectCD, InCD, or HP DLA)
they received a message like this:
"This disc contains a "UDF" file system and requires an operating system
that supports the ISO-13346 "UDF" file system specification."
This seems to be happening primarily with CD-RW media. It's not really
clear what's going on.
In theory, installing a UDF reader will solve the problem. Recent versions
of Windows come with UDF support, so it shouldn't be necessary to do
anything to get the disc to work. However, the problems persist.
One possibility is that the disc isn't using a quite standard version of
UDF, and the reader is having difficulty. Installing the software that
created the disc in the first place will help.
When exchanging data, "closing" the disc to ISO-9660 format can help avoid