There is one option but I didn't use this because I don't know what is all does (and because the machine isn't mine) and that function is:
admittedly it is not very well documented, and i can't find the manual on Brystons website right now, only the Pi... In my dl'd manual resetting the DB isn't mentioned.
But here goes:
clicking the gear icon of media Player settings:
gives an option to click Reset DB and Save.
Do that, (click Reset DB) restart ((I think the BDP does that automatically, if not click reboot in System), and let the BDP update its library.
Might take awhile, (large library, small memory BDP1) but still, only 1 tb shouldn't take all day
Cheers,
Marius
btw that same window offers the option of enabling the Bryston DB. Don't do that! It is not compatible with the BDP1 and large libraries.