Oh, and you're going to LOVE this development. After my last attempt to reflash/clean it, I plugged it into my Windows 7 netbook. Windows said I needed to format the internal drive before I could use it, so what could it hurt? I said yes. Windows formatted it, and so I put a file on it to test.
When I unplugged it, the PP could see the test file !!!!
So, looks like these problems are not so straightforward after all.