Superdrive only reads half the files on a DVD

I am running Mac OS X v10.3.9 on a 1.25 ghz G4 iMac.
I got a commercially produced data DVD for Christmas. I don't know if it is dual layer or what, but it contains 5.35 GB of mostly acrobat files.
I can read and/or copy about half the files on the disk, the other half of them error out or lock up the finder when I try to copy and when I just try to read/open them the ball spins for a long time then just stops without opening anything.
All the files open without difficulty on the Windows PC at work.
Is this weird or what?
I rebuilt my permissions and no improvement. Any ideas what else I should try?
Thanks!!

Could the disc(s) in question have been burned using a utility that allowed
multiple sessions; and not been set to be used in both Mac and PC?
Some can do that and not be recognized. Third party disc burning utilities
can also add files to burned CD-RW or DVD/RW discs; but they may not
all be seen by the different optical drives and/or software in other systems.

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Superdrive only reads half the files on a DVD

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