Do you want to run the 2 x SSD in RAID 0? If yes, then you need to mount both SSDs in the standard hard drive bays, RAID them together, then install OSX, THEN remount them on the Sonnet Card.
If you do NOT want RAID, and just want two separate drives on the Sonnet, then you don't need to do anything fancy. Just move the existing drive to the Sonnet and it will continue to work, and mount the new drive to it and you can format it as needed.
It's only when using RAID that you need to first do it all in the standard drive bays.
Hope this helps![]()
I was able to successfully install RAID-0 SSDs on a new Sonnet in a 2012 Mac Pro using a USB fresh install of OS X 10.8.3 just last week. I had another issue which caused me to also perform the in-bay install then transplant the SSDs to the Sonnet which also worked equally well, although the issue remains.
The issue is that I cannot get a "option key" restart boot-device menu if a bootable drive is installed on the Sonnet card. Sonnet technical support has been able to duplicate the problem and issued a Trouble Ticket with engineering and they hope to have a firmware fix available soon. Other than that small issue ... the card is performing great! (I did exchange the card for a new one, and the replacement also had the issue
-howard