To totally reformat the hard drive which will delete everything off it go to your applications folder and then to the utilities folder and double-click on disk utility. In the left hand column select your drive then select the erase button once on the erase section select the format you want to format the drive in (if you are only going to use it on a mac select Mac OS Extended, if it is going to be used on both mac and PCs select MS-DOS (FAT)) then choose the name you want to call your drive and then select erase.
REMEMBER THIS WILL WIPE ALL THE FILES ON YOUR HARD DRIVE.
Hope this helps.
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