Nelsn, It may be of interest to you that I prefer to use two products (not free) from Coriolis Systems, for a mid-2010 Mac mini with a 500 GB internal disk and about 9 TB external storage.
Currently available updated versions for Mac OS X v10.10.1:
iPartition // ver. 3.4.5 (207.8)
iDefrag // ver. 2.2.8 (408)
-russ
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