Continued to fiddle with iPod. Demonstrated the ease with which music can be extracted from iPod and inserted into iTunes for Windows, even without copypod of ipodcopy.
But I still couldn’t put new photos on it without it corrupting the photos. Tried Disk First aid: nothing.
So I reformated it again, now for Mac, and reloaded it.
Now it seemes to work OK, and response to clikcwheel is faster, too!