Try creating a disk with a large directory, more than two tracks. Then try to display the directory. On all of the drives that I have tried, you will hear that little "click/tick" sound indicating that it tried to step the heads too fast. You will then get a spurious media failure message. Of course, it is possible that I missed something in the instructions, but I beat my head against it for a long time. Then tried the older version where you can manually set the step delay and volia! No problems.