I've come across a strange issue. I've got some files on a DVD that I burned from Windows. I place the CD in my RHEL6 system it sees all of the files just fine. I load it up in the RHEL5 VM (VBox) it can't see the zip or folder from the zip but it can see the other folder. I open up the test VM of RHEL6 and it can't even mount the DVD. I look under /proc/filesystems and host RHEL6 has UDF, guest RHEL 5 has UDF and guest RHEL6 does not. UDF tools isn't installed on any of them. I've disabled SELinux and that didn't help and I can't find anything useful in the logs and, no, they are not hidden (ls -alhZ).
So, why am I not able to see files and what is stopping me from mounting the CD on some RHEL systems? The missing files is really weird, though. I can't think of anything that would make some files not visable.