Heh - look at me, anwering my own post/question...
First, I have my books sorted by genre on the DR800 (Science Fiction, Fantasy, Action, etc).
I took one of the folders and copied it to my PC. Then, I changed the name of the folder (added a "1" at the end of the folder). Then, I put the folder back on the DR800 (didn't delete the other one).
NOTE: It doesn't work to just move the books around. Has to be at folder level (or, at least that's what I saw).
When I ejected the DR800 from my PC, it indexed that new folder and all the books in that folder now have the thumbnails showing. Unfortunately, if you were already reading a book in that folder, you've lost your place (trust me, I know this!

). Guess because it's a "new" add...
So, it's not going to be that bad to index all my books. Once I'm done, then I'll see how long it takes to index after ejecting from the PC.
Off to index!
Marilyn
P.S. Just notice your reply, Dellaster - thanks. Where might that metafile be? You talking the main one right in the first level of the DR800?
P.P.S. I really just have this DR800 to read books, which it was doing fine before the update. But dang! - it's way cool to have scribbling, zoom and (wait for it...) - GO TO PAGE function! Whoo-hoo! Now, can we just get unopened TOCs with a back function ...? <--- Never hurts to ask, eh?