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AnswerThe easiest way is with a startup disk made from a windows earlier,switch from a:/ to c:/ than type c:/format c/q.this will do a quick format." However, a quick format leaves most all the data on the hard drive for anyone with the right utilities to look at.

To completely wipe your drive, you need to use the CIPHER command with the /w wipe option. The wipe option will overwrite all unallocated space with 0s, 1s and then random numbers three times.

Run the format command first, since CIPHER only works on unallocated space (helping you make sure you don't accidentally erase something you intended to keep).

After you have reformatted the disk in question, open the command prompt and type: cipher /w:[DRIVE LETTER]:\

So if you are wiping your "E" drive, it would look something like this:

C:\> cipher /w:e:\

If you have a version of Windows that does not include Cipher (like XP Home edition), you may be able to get it from the Microsoft site.

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Q: What is the command prompt to completely wipe and reformat a hard drive that already has XP installed?
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