Check this out- this is my disc after capturing roughly 6 tapes (2-cams) from my most recent wedding...
http://www.msprotege.com/members/LazerBlueP5/Disc%20After%20Vegas%20Capture.jpg
After it was finished defragging it alerted me that two files couldn't be defragged...they were both really long clips- one at 12gigs and the other at 11. I'm assuming there wasn't enough space to compress the other files to make room to move these two without re-fragmenting them.
Why does Vegas Capture always fragment all my captures like this?!