it was only answer to theory mentioned in #3
- i.e. USB 3.0 card used with MorphOS like 2.0.
I don't think such card exists.
Now I am using in my X1000 PCIe 3.0 card, it works in linux like 3.0 and not works with MorphOS ( no surprise).
AmigaOS: Pegasos II, Sam440ep-flex, Micro A1-C, AmigaOneX1000
MorphOS: Pegasos II, Powerbook G4, iMac G5, Powermac G5 Quad