I just got new rMBP and it came with mavericks. first thing I did was run diagnostic test no problems found so next I erased entire hd. (I been using yosemite since early beta and i am pretty use to it now, so i figured i would install it like i did on old MBP) I wanted to create Recover HD but will wait till Recovery Partition Creator updates foe yosemite. after it booted and I installed some apps and decided to repair permissions with disk utility enabled disk utility debug menu selected show every partition and I found Macintosh EFI (hidden) Macintosh (hidden) Recovery HD (hidden) I thought I made a mistake so erased it again (firewire through my old MBP) checked it with diskutil corestorage list came back "No CoreStorage logical volume groups found" re-did installation of yosemite and again when it booted up it created hidden macintosh and recovery hd. Recovery HD doesn't show up at boot when hold down option key. ran diskutil corestorage list and there it was again how do I stop it from creating fusion drive automatically? I have only one 1TB SSD, why does it create logical volume? and how do I stop it? can someone share some thoughts on this?