If you think that your data might not be secured from others and if you just want to make it secure then Apple has neat trick for you in their store. Apple has a tool through which you can make sure that your data is safe in a place and can be accessed by you only.
You can use this tool to prevent others from booting you Mac machine and getting access to your valuable data. This is nothing but a
firmware password protection tool which can give you a low-level sufficient password protection for you Mac machine.
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How to set up Firmware Password Protection for Mac OS X
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