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What I am trying to do is just wipe my C:\ drive and reinstall an operating system. Is the command the one I want?

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What OS are you going to install on it after you erase it? – Wuffers Jan 23 '11 at 2:57
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Why would you even need that? Should you use the standard Windows 7 installer, booting from a USB or DVD, there's an option to format your system drive before installation – Martheen Cahya Paulo Jan 23 '11 at 3:29
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looks like a duplicate of superuser.com/questions/236657/what-will-format-c-do – warren Jan 23 '11 at 5:04

If you are installing Linux, then you shouldn't need to reformat your hard drive before installing. The same thing applies with Windows.

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