Example at http://forums.cnet.com/7723-6132_102-119247/this-is-scary/
In my opinion ANY of the zero fill free hard drive space will be sufficient unless you are turning this over to the NSA. Why must it be SHRED?
And how you handling the scary parts?
Can anyone recommend a utility to "shred" unused disk sectors? Is there such a utility that would leave used portions of the disk alone?
I have an old Windows 7 computer that I wanted to pass along in a usable state. Since it had some Windows-related config issues and didn't work reliably anymore, and since I didn't have the OS installation media, I decided to get it working again by restoring my oldest backup, which unfortunately included lots of personal information.
Although I was able to uninstall programs, remove the user accounts and delete other personal files, that still leaves lots of content potentially recoverable.
Someone may ask why I didn't use a regular file shredder when I did the deletes I mentioned in the previous paragraph. I didn't think that would be practical simply because I would have needed to identify the individual folders and files to delete/shred instead of relying on the program uninstallers and the account removal process; using the uninstallers and account removal process automatically located and removed content I may not have known where to find.
So, anyway, as I think you can see, that leaves me wanting to "shred" all the unused disk sectors that may contain potentially recoverable data.
If you've heard of such a utility, your help would be appreciated. Thanks, folks.