User Feedback :: 2.2b USB corruption

Sounds like a classic case of mismatched minirt24.gz and knoppix image.
Do a clean install to the pendrive, don't copy over parts of the system,
Major differences in modules from 1.5 to 2.0, 2.1, to 2.2.
Modules in minirt24.gz must match the kernel inside the knoppix image. Otherwise lots of boot time error messages and most things will not work!

original here.