My HFS+ volumes not visible in OS X anymore


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Both of my Mac OS 9 Partitions (one norwegian and one english OS) has disappeared. Both are HFS+, and are on the same disk. They used to be there, but isn't anymore. My Firewire disk and my Mac OS X disk is still visible. I can boot and see them from Mac OS 9, but not OS X. Can you help me?
Seen this problem in OS 9, try Disk First Aid to mount and repair the drives. Don't know why it happens, but have, so far, always been able to see the drives again.