I have two harddrives (each one is 160 GB). I am running XP on my C drive. I use shrink and dvd decrypter for my movie backups. I save the ISO file to a folder that I set up on my second drive. After I am done burning my movie onto a dvd5, I always delete that ISO file from my HDD. Do I need to defrag if I am deleting the movie from my harddrive? I have read a lot of posts lately about people complaining about Shrink being really slow, and others are suggesting that they defrag their drive. I have no current problems with Shrink being slow.