As every Mac user knows that Mac OS X and OS X lion have a hidden partition on their internal HDs and the name of HD is "Recovery HD." This partition or HD is somewhat equivalent to OS X Install Disc on your system and it is more convenient. This is not my saying but many Mac users saying this and I have seen many posts like this. I also have one in my OS X lion system but I don’t know how to use it and what exactly the use of that HD.
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