I've got two drives in my PC, one is 80GB and the other is 120GB. I do tons of video editing and downloading. I recently analyzed my hard drives and found that both needed to be defragged. I defragged the 120GB drive (used to store edited video clips) with no problems. When I try to defrag the 80GB drive (games, apps, etc.) it doesn't work. It will go through the defrag process, but will hardly clean the drive up at all. I'll try to defrag again and it comes back within seconds saying it's done. If I reboot and defrag it will go through the process and slightly clean up my drive. Every time I analyze the drive it says to defrag and the disk usage graph shows more red than blue. Do I have to reboot, defrag, reboot, defrag forever until the drive has been cleaned up? Am I missing something in the defrag process that I should be paying attention to? Any help will be appreciated, Mick

How full is the drive? The defrag process needs a good chunk of empty space so that it can temporarily write information to it. Otherwise you'll get the result you're describing. If you have plenty of free space, I don't know what the hell is going on.

I thought that might be the problem at first, but I've got about 35% free space and defrag needs 15%.

Try scan disk, then do a defrag. . .if the scan disk gets all the way through defrag should theoretically work.