New
#141
Good ole Albert was absolutely right. But in this case, I haven't done it over and over. In fact, I haven't even done it over.
I upgraded once, and it appears that the issue was file corruption. Trying the upgrade again - in the different circumstance I've mentioned - is quite sensible, once I can be sure this is not a bad drive.
If the drive is healthy, and I do it again and it fails, that will be my second and last attempt.