Google for the these to d/l, KILLDISK or DBAN, and/or use the keywords, erase HD. These pgms. are free and do a great job. Most are available as floppy version or a burnable and bootable CD version in ISO format. Beware, its use will completely wipe out any HD, so direct its use to a solo HD and further you can run the pgm. again, but even 1 pass is enough.

tada -----Willy Happy