Dev 1/42 is the root file system. It is almost always a HTFS file system and there are no other operating systems that support this type.
Even if you do not have 5.0.7 installed, you may be able...
There really is not a lot you can do. You have filesystem corruption. If you do not have a backup you can try checking and replacing problematic cables or raid (NAS) boxes. If you have another SCO...