My first time setting up a raid with disc utility. I have ten drives in two enclosures. When disc utility opens, it shows 20 items...the ten drives by name and below each, the volumns. When I drag all items into the box, it shows twice as much space as there really is. When I have dragged either of the ten items into the box, it shows the right amount of storage, but when I run the program, it reads "Creating Raid set failed" "Could not add a raid disk to a raid".??? What am I doing wrong. Thanks for your time...and a very happy holidays to you all.