| Some filesystems are worse than others. Unix has a standard wastage of 10%, but this is adjustable. Allowing more than 10% for FS tasks makes the defragmenting routines built into Unix run faster, but means you lose a little disk space.
Mac OS X's HPFS is marginally less than 10% used for filesystem tasks, this seems to run the fastest on Mac hardware, but you should allow for this when you buy a drive according to size, around 8-9% will be lost to the file-system.
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