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ISO 9660 / Joliet Level 3 CDs not supported by OS X
Authored by: tempel on Nov 15, '06 02:52:46AM
Here's a word from the author of the "Joliet Volume Access" and "Adaptec UDF Volume Access", which can both read such DirectCD discs on Mac OS 7-9.

It is quite clear that the ISO 9660 driver in OS X is not able to read fragmented files, as they may only appear in ISO 9660 Level 3 discs (but not in Level 1 and 2).

Now, if you use the above method to mount such a disc on your Mac, it only means that you can access unfragmented files. But those that are fragmented (that's the ones that appear with multiple identical names in a listing in Terminal) can not be read completely as either the OS X driver would have to know how to concatenate them into one single complete file, or would allow us to read all the pieces and put them together ourselves. Neither works, however.

Hence, if some of you report that they could read all their files, then you were just lucky that none of them were fragmented on the disk (or you haven't even noticed yet that you have some incomplete files now).

Whether you have fragmented files on a disk or not depends on the software that wrote it, and how. I'd suspect that those Sony cameras who write pictures to CD-R are able to write the picture files in one piece (unfragmented) to the disc, so you'll be able to read those pictures just fine with the methods described here. But if you've used DirectCD on Windows, it's more likely that large files that you copied to the CD-R are fragmented, as that's how DCD works when it writes large chunks of data - it can't write them contiguously, or so I believe.

I hope this clears up the effects people have seen here.

Basically, if you have a Level 3 disc that you can only access with the methods described here, better make sure that when you copy the files off of the CD, that they're really all complete. If you have incomplete files or other read problems, you need to use a Windows system or Mac OS 9 with my Joliet driver ( to read them properly.

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