I've just installed Redhat 6.1, and have noticed that I get repeated messages of the form "kernel: VFS: Disk change detected on device ide1(22,0)" pouring into the syslogs. The machine in question has an IDE ZIP disk and CDROM, but no other IDE devices. Obviously not a real problem, but a bit irritating.
This is due to magicdev polling your CD drive; check the CD properties in the Gnome Control Center (gnomecc)
*** This bug has been marked as a duplicate of 6006 ***