I have two WD MyBook 500G disks that I setup in raid 1 (mirroring) since I've had some problems with one of the disks earlier. Suddenly the raid setup became incredibly slow here, to the point of not being able to read or write anything. And Disk Utility tells me that the setup is "Degraded". I thought the point of raid 1 was that if one of the drives failed that it would still be usable, but that doesn't appear to happen now. And if I unplug one of the drives the entire thing goes away and I can't see either of the drives in Disk Utility. So. What to do? HEEEELP!