I just finished to burn it - it's my first BD burnt, hurrah! To have this disc into my hands, it's different than have it into the hard disc, is... well, another... "thing"!
Well, I used IMGburn, and it took THREE hours to format the disc (a BD-RE), and THREE hours to burn it... is it normal?!?!?
I tested in my PC and all seems OK; tomorrow I'll test it in some BD players.