|After having received DelMansHus's reply, I tried to save my USB memory stick with diskpart, but at the "clean"command I got an error message that "the disk could not be cleaned because of an I/O error".|
I concluded from this that repair was not possible, so I discarded it, but only after having looked inside to look at the mini board.
Going back to this topic to tell my experience, I found OtheHill's advice, but alas that was no longer possible after my premature inquisitiveness.
Pity because just replacing something when there are problems is too easy for me. I worked in a development environment in Africa and a university at that, where there were no spare parts available, but I found them in the 2 x 4 x 8 mtr scrap heap full of discarded equipment in the courtyard of the hospital and was able to do a lot.