SongPony, you need to visit the Microstudio
Beta 10 Thread (you can see it because you are a Microstudio Beta Tester

) and download the test file in post #23 (page 2). Follow the instructions.
Please post your results in the Beta Testers thread as this is experimental and the results are private.
For the others of you posted in this Thread, know that we are actively seeking a solution on our own. Our "vendor" that supplied the drive interface code is not responding fast enough to our liking. We recognize there is a problem with Plextor drives, and hope our "test" will turn out to be the solution.
We'll make any successful results public. If it fails, we'll try something else until we solve the problem.