If you have been having visually corrupted clips and/or failed checksums while using an express card adapter (in my case pre unibody 2008 MBP) your problem may be that you are in 64bit. It was for me. Go to 32 bit and all problems go away.
Hope this helps
Ps to force boot in 32 bit push and hold 3 and 2 on boot.
-Nate Clapp


