OSX does not require a defrag. Though there are applications that defrag and optimize, neither of which are bad to have, and I use them when I get bored
Well, I would *NIX's are better with framentation as a whole. You should RARELY ever need to run a defrag. Especially now that Darwin is utilizing journaling. *NIX has always been smarter about the way it uses disks. As for specifics, I'd have to dig 'em up...
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