So its the manufacturers BS advertising using 10 base instead eh, typical rip off merchants. Thats explained my age old quetion why HDD's dont come up to their quoted size too.
Regarding BSOS being best f/w for the 1633s - if your not doing dvd-r @8x then it is!!!
I found BSOS with Verbatim MCC01RG20 dvd-r 4x certified @4x burn = perfect scans
I never normally use dvd-r, but since I couldnt get the 4x Verbatim MCC002 dvd+r last time from my local store since it was out of stock
(this is my budget media 25 on a spindle @ Â£9.99 = 40p each)
I picked up Verbatim MCC01RG20 dvd-r 4x at the same price on a similar 25 spindle and have found it burns with perfect scans. I actually love this media its so good.
Never tried burning dvd-r @8x and I think its unlikely i ever will since I prefer dvd+r, for me the BSOS works best and I'll send you scans to prove it if someone shows me how to post these on the forum.