wipe a hard drive

[lmaduro]

I have to install new operating systems in various hard drives. However, all of them have previous OS of which I don't have any info besides what is available at the first screen. Some of them run linux, some others have windows. I do not have usernames or passwords for any of them.

Question:
How do I completely wipe every single hd without the login information?

Thanks!

 

[clutchc]

Dban?
http://www.dban.org/
Make a bootable Dban disk and use it.

 

[VernSummer00]

Hello,
Merely wipe them all after you do have backed up all very important data inside these drives on other devices or locations.
Go try some drive formatting software out there.

 

[lmaduro]

thank you all