I've been having a similar error that Hustle is reporting ever since I had to install a new HDD when my old one died. It used to work great without errors, but once I installed a new HDD, I had to install some drivers BEFORE installing Windows 7, otherwise I would get an error. Something about newer HDDs needing that driver before installation. It had to do with Intel RAID chipset IIRC.
This is the error I'm getting.
[F:ScsiGetAddress][L:59] GetLastError: 50, The request is not supported.
The interesting thing is that the discs still dump fine.
Another interesting thing is that since I re-installed, Exact Audio Copy is also having trouble finding one of my drives (one that came with my PC, not my plextor). So I think this problem could be related to that pesky driver that I had to install BEFORE installing windows on a brand new HDD. It's the only thing I can guess that's causing this behavior.