Formatting primary drive?

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http://forums.anandtech.com – I want to format my HDD before selling it. Is there any way I can just boot to the command prompt and do format c:? Sorry for the noob question, usually when I format a drive I just pull it out and hook it up to a USB adapter and format from another computer, however this is a laptop drive with ATA interface that I don't have a USB adapter for. (Hardware)