I've noticed that when I check the disk info on the dvd's I have, nero says 4.489 is the capacity

The bar on the bottom of the compilation is also set at right below 4500 megs. Is this setting adjustabel? Can it be reset?
Should this be set higher and how do you set higher, up to like 4650 maybe.

I ahve compiled a couple of Dvd's and thought I was comfortably under the limit, thought I was at 4600, but no dice, no burn, replace disc with more capacity.

All my discs say 4.489. 2 different batches of dvdrs and one of dvdrws.

I am re-encoding down to that size, but now I wondering?

thanks,

JIm