Clearing the unallocated disk space

[jd1008]

On 11/16/2014 03:01 PM, Ted Roche wrote:
> The Fedora 20 repo includes a utility called 'scrub' and it has a mode 
> to scrub free space.
>
> On Sun, Nov 16, 2014 at 2:04 PM, jd1008 <jd1008 at gmail.com 
> <mailto:jd1008 at gmail.com>> wrote:
>
>     Before sending the drive for warranty service, what is the best way to
>     clean the unallocated blocks?
>
>     The rest of the files on disk are OK - standard installation, ... etc.
>     All home dirs are deleted, tmp dirs, logs ....etc all deleted.
>     If you can think of other things to delete, pls let the world know.
>
>     Thanx.
>

Thanx Ted.
I had forgotten all about scrub.
Now if only someone would tell me how to locate the journal blocks.

If I mount the drive with the journaling disabled, will the blocks usually
used for journaling become free blocks, and thus be covered by scrub???