DVD ripping - size calculations are wrong

[dgrainge]

I have copied a DVD to an iso image. The image works, but Daemon reports copying 54000% by the time it completes.

Daemon Tools Pro Advanced, 4.35.0306.0088 Evaluation version. Windows XP Pro SP3. Athlon 64 X2 dual core.

If I purchase it's likely to be a large order, so fingers crossed someone can suggest a solution. Unable to see anything on this subject on the forum.