My nero enterprise edition questions?

hey everyone,

my above ver nero shows my blank dvds as 4.4 gb i aint complaining but is this normal for everyone and btw i have no choice but to use costly media such as verbatim and imation my drive is 3500ag and i was just wondering whether the space issue was AOK! i complete a +r in 9 mnts on 8x and is there anyway i can check the quality of the burn

i heard kprobe is for liteons only is this true? and is there anything else i could perhaps check