@Oepabakkes

"So I wonder why can't it read/write Amiga disks ? Yes I know, pcdrives don't do Amigaformatted discs."

There you have your answer.

"As I say I didn't expect it to work."
??

"But now I wonder, can it be made to work somehow ? Put an Amiga floppy drive in there or as such ?

Not with those USB floppy drives. However, the Kyroflux should be your solution.

http://www.kryoflux.com/