Originally posted by fatlander
[B]You cant wipe all of the data and leave the os intact (you can do it manualy but you will probably leve something)
agreed, there will still be data unless you use a program like eraser: http://www.heidi.ie/eraser/download.php
to delete individual files or groups of files.
eraser is freeware, btw
however, this means you will have to know the location of everything that needs deleting.
If you want to wipe the HD the bast way is format, delete partitio, create partition, format
that's not the best way, and it requires too much effort. windows machines do not perform low level formats. you could never be sure you wiped all the sectors.
the eraser program i linked above provides a tool to create a 'nuke' boot disk. create this disk, then boot to it in the machine that needs wiping. then go have a beer or two. when it finishes, the drive will be as data free as is practically possible short of destroying the media itself.