Ok, so I bought a new iMac 27" 5k this week and a LaCie 2Big 6TB RAID to go along with it. So far everything's good. However, I noticed that the LaCie HD disappears whenever I shut down the computer and turn it back on. The HD goes to sleep when I turn off the computer (blue light goes off) and it powers up again as soon as I turn on the computer but then it doesn't show on either the desktop or the "devices" panel in finder. When I then turn the HD off and on again it appears on the desktop. Right now the HD is still empty and I formatted it as "Mac Extended Journaled" (no encryption). It's attached via the Thunderbolt 2 port. What could be the problem?