HDD wipe

i currently have 2 HD on my comp... i use one.. and the other has a bunch of stuff on it that i would like to get rid of (ie.. old windows..etc) so how do i do that? is there a special program that i have to buy? do i just need to format it somehow? some step by step instructions would be very helpful
thanx

Yes you have to format it... There's a few ways to do this. Did you only have Windows on it? If yes make a bootable floppy disk (format it with the "Make an MS-DOS startup disk" box checked).

Then reboot your computer with the floppy disk inside wait till everything is booted... Then type "format c:"

The will erase everything on your partition (I'm assuming you have only one.) And now your drive will still be in the FAT32 format. I guess this doesn't matter unless you want it NTFS or whatever but you can do that afterwards.

You cannot and should not format a hardrive when important files (windows system files) are in use.

But dude... it's crazy how many sites teach you to do this. Next time stfw.