http://live.pirillo.com/ - Everything you have on your computer more than likely sits on a hard drive - your operating system, music, pictures, programs, and everything else. When you put new data on your hard drive, the data isn't generally optimized - the files are fragmented across the space of the hard drive.By defragging your hard drive you can more optimize your hard drive, which will let programs load and access data faster.Nick on YouTube wants to know if defragging will cause problems for programs and if there's a way to defragment your hard drive too much.There really is no such thing as "too much" defragging: once the files are no longer fragmented, you just simply can't defrag anymore. Of course, problems can arise if something happens during a defrag: if power is interrupted during a defrag it's possible that you'll lose the data the program was working with.Simon from YouTube wants to know what the best defrag utility is. We recommend DiskKeeper, but what do you use and recommend?Want to embed our What is a Defrag? video in your blog? Use this code:Chris | Live Tech Support | Video Help | Add to iTunes Less