I don’t claim to be any expert but my guess is that Apple’s (software?) RAID took over and reconfigured the RAID. WD Drive Manager is obviously imcompatible with Mavericks as it appears multiple times in the menu bar everytime the drive is mounted and does not go away without a restart. The Empty/“MyBook” state of the drive is stuck no matter where I tried it (OS 10.8 and 10.6 with and without WD software).
I chatted with a higher level Apple tech support and sent him links to these discussions: https://discussions.apple.com/thread/5475136?start=0&tstart=0 and https://discussions.apple.com/message/23505869?ac_cid=tw123456#23505869. The end result at the moment was a low level data recovery recommendation which I will try to avoid as long as I can.
I’m holding my breath waiting for a solution from Apple and/or WD where my old volume and data will magically reappear.
