If you really want to be sure... replace the hard drive in it
That alone would of course not preserve any content; if it were done along with a correct backup and restore, it would be sufficient but not necessary.If you really want to be sure... replace the hard drive in it
It's not for SSDs.It turns out, Microsoft finally built in a utility for overwriting and clearing free space. And I've tried it and it seemed to work well. I learned about it from this article:
The command is:
where C is the letter of the drive you want to securely overwrite the free space on.
Use a command prompt window with Administrative privileges.
Don't run anything else while it's going on. Expect it to take hours, possibly run it overnight.