I have a small solid state drive (ssd - 120gb) which I use as my main C:/ drive. It has become overloaded with junk and I want to safely remove any unnecessary programs and reinstall to an external hd those programs which I use but are taking up prime real estate. I'm down to 10% available space. I know I should also defrag the drive as well. I don't think I've ever done that on this drive and it's about 1 1/2 years old.