I have a disk in a firewire bay which shows up in Disk Utility but does not mount because a RAID enclosure messed up the format. If the disk is not mounted how can I reference it in command-line to run fsck_hfs on it?
Unforunatly, I haven't found the way to do in in osx. However, the best thing to do (that worked for me) is to boot Hirens boot cd* and check it with some of the filesystem tools (Ext2fsd was used in my case).
Hope this was useful :)