TMPGEnc DVD Authoring Works 4 DVD+r space problem

[gigaslackr]

I have a question that I cannot find the answer to. I am using TMPGEnc Authoring Works 4 to burn some DVDs. I am using Verbatim DVD+R discs. When I set the output size to "single dvd 4390MB" and burn the DVD I end up with a large ring of unused space left on the disc. When I look at the back of the disc itself (the burned side) I can see a ring about a half inch wide still unused at the outer edge of the disc. I know standard DVD usable space is only supposed to be 4.39GB, due to the conversion difference. But why does there appear to be so much empty space left? Also when I put the disc back in the drive and check the used space it says I only used 3.17GB. Is there a way to change this so it uses the entire free space on the disc?

[marioval]

When you choose the output size, you are just choosing what type of blank disk you are using. You are not choosing how much space to fill on the disk.