A case-sensitive filesystem. Fedora 6 stores resources on disk in an OCFL repository, and OCFL requires a case-sensitive filesystem. By default, Windows and Mac systems uses case-insenstive filesystems. If you intend to run Fedora on such a system, you have to make sure to meet 1 of the following requirements:
Locate Fedora home on a case-sensitive volume. This is an exercise for the reader.
Do not use Archival Groups. Case related resource name collisions can only happen when dealing with resources contained within the same Archival Group.
Do not name two different resources the same but with different casing.