Hi,
On the Medéa issue, they are not working under OS X. There is some changes you can make with a terminal application, however this is not a great solution. We have been told by the Medéa guys they are working on the problem, and should have a fix soon.
We don't recommend these disks until the issues are solved, and we will announce when they are compatible.
Regards,
Grant Petty
Blackmagic Design
http://www.blackmagic-design.com