Check to see if the raid share is showing up under /home/public/data/other. That's where it will be if the PK_Users is set to "Public" instead of "Pluto's structure".
On the file server, only the raid volume (ex: /dev/md0) should be shared by samba, not the physical drives (ex: /dev/sdb1).
Thanks for your suggestion, Roy. I thought about changing the PK_Users to "Public". But I was afraid that this might break recording and ripping functionality.
Also, I don't see such device /dev/md0.