Partitioning an already heavily used disk for bootcamp is probably the closest any relatively normal user would ever get to needing to degrag an OS X volume. A

Partitioning an already heavily used disk for bootcamp is probably the closest any relatively normal user would ever get to needing to degrag an OS X volume. And pretty much the only time a normal user would ever need to reinstall OS X is if something went seriously wrong with the system files. It's a very abnormal thing to encounter. And even if you somehow need to do so, the option to preserve user information has been in OS X for a long time.