[ubuntu] How to COMPLETELY FORMAT a Hard Drive?

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http://ubuntuforums.org – I have 2 hard drives at the moment. 1. Internal Laptop HDD - I have 2 partitions, one partitions works just fine, other don't, but I extracted all my datats from the one that doesn't. 2. I have an external 500gb HDD, which I am booting ubuntu from and have stored all my recovered files in there. So now, I need to COMPLETELY wipe out, format and refresh my Internal HDD. which needs formatting because of the corrupt windows files that even block proper fresh windows 8 installation. HOW? I tried "DISKS" application but it gave me an error. I can use testdisk to copy files from the (Hardware)