I have two external Oxford hard drives in a single firewire case that were set up as raid slices a couple of years ago. Now when I hook them into my computer (Mac OS 10.5.4), they do not appear in the finder. If I go to disk utility, they are there, but I can't do anything with them. It gives me the option to convert from raid set version 1.0 to 2.0, but when I push the convert button it comes back and says that it could not convert. It says that it was an invalid request. I suspect that something needs to be updated since the hard drives are probably outdated, but I don't know what to do. Please help.