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Message: <blockquote data-quote="bobtomay" data-source="post: 1303627" data-attributes="member: 24160">With reference to defragmenting - for most users, it is not necessary.  OS X does an excellent job at keeping files defragmented.  What it does not do at all, as best I can tell, is defragment free space.  So, for those that are filling up their drives above about 40-50% or have a habit of moving a lot of data on and off the drive, over time, you'll find that both the data and the free space can be scattered from one end of the drive to the other.The two primary effects of this are: 1) those waiting for some while after getting their Mac prior to using BootCamp Assistant to create that Windows partition and 2) when you hit between 35-50% free space, depending on how much you move data on and off the drive, you may start seeing some slow downs just due to the fact that some of your data is now sitting on the slowest area of the drive.</blockquote>