I guess Bookeen was really swamped, since I got a reply to my original mail today.
It was a friendly suggestion to format the CyBook... which obviously wouldn't have worked, since it doesn't even show up as a removable drive, so there's nothing to format...
Also, wouldn't that leave the device without firmware?
Anyway, it's all a moot point since my CyBook is on it's way to France (or where ever they send them for repairs).... I thanked them for their time and informed them that I'd sent it in.