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not sure how this works, but can you have an entire hard drive encrypted and can it be your main hard drive with Mac Os/X on it or is it more of just for data only? i.e. other than base os files.

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Similar question on apple.se: What are my options for full system (or at least home directory) encryption? –  sleske Aug 26 '13 at 11:51
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2 Answers

PGP Whole Disk Encryption will work on OS X.

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is it very slow on a laptop? –  user27449 Feb 25 '11 at 15:20
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Yes, you can. There are two options:

Note: While TrueCrypt works on Mac OS X, it unfortunately does not support encrypting the system partition.

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