Hi Matt,
We've seen a few issues with the Crucial M4 SSDs and the Hyperdeck Shuttle. The key thing is not so much the speed of the disk, but the way in which the disk writes data.
For more information on these issues, as well as our current list of certified SSDs please see the following support article:
http://www.blackmagic-design.com/support/detail/supportnotes/supportnote/?s...
Chris Pearse
Technical Support Consultant
Blackmagic Design EMEA