Disk wiping/securing free space

Hi All

New to these forums and was hoping for a suggestion. I have searched the free software and tried several forums searches but am not finding what I was looking for (this means don't whap me if the answer is obvious, I did search first ).

I want to wipe the unused disk space of an old laptop before selling. I have used Active@ Kill Disk but was looking for a better solution that is hopefully free. I am currently cleaning an XP system but was looking for XP/Vista if possible. I have run ccleaner but realize that the underlying file can still be recovered .

ANy opinions welcome

 

Kill Disk actually has 'free' option to wipe your hard disk. http://www.killdisk.com/downloadfree.htm

I also like Darik's Boot And Nuke. http://www.dban.org/

Though it seems to have some incompatibilities with some of my computers. But nonetheless, it works just as good.

 

The only solution you're going to have is to wipe the entire drive with a tool like Darik's Boot and Nuke as Mike suggested, then re-install Windows. What you are trying to do is inefficient and risky.

 

sDelete:

http://technet.microsoft.com/en-us/sysinternals/bb897443.aspx