What are the situations in witch you may have to clean install OS X? I kniw it is fast and harmless, but is there any advantage to do so efery few months? Also, is it ok to install and reinstall bootcamp multiple times? I mean, is there any harm to OSX in partitioning the disk e ery couple of months? First I had bootcamp on 50GB, then I decided to go for 150GB, few weeks later 250GB, now I want to go for 300GB. Am I harming Mac OS in the process?