See if this writeup helps you in prepping your HD [http://mac.tutsplus.com/tutorials/os-x/the-master-guide-to-formatting-a-hard-drive/|The Master Guide to Formatting a Hard Drive]
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See if this writeup helps you in prepping your HD [http://mac.tutsplus.com/tutorials/os-x/the-master-guide-to-formatting-a-hard-drive/|The Master Guide to Formatting a Hard Drive].
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As you don't have anything on your disk ''Erase'' is not an active option. First partition the drive with one or more partitions. I like two one for my OS & Apps and the second for my data that way I only back up second data partition every day and backup my first partition when I update or add in any new apps. You might want to leave some space if you plan to use BotCamp with MS Windows or think you might use another OS. Apple by default setup the system with one partition. Then you can format the partition/s as needed.
See if this writeup helps you in prepping your HD [http://mac.tutsplus.com/tutorials/os-x/the-master-guide-to-formatting-a-hard-drive/|The Master Guide to Formatting a Hard Drive]