scrub, in the Fedora repos, has a fillzero option and a freespace specifier that should do the trick. MAKE A BACKUP FIRST, as scrub's primary job is to erase any trace of everything on a device, so you'd hate to get the options wrong!

On Wed, Sep 4, 2019 at 4:41 PM ToddAndMargo via users <users@lists.fedoraproject.org> wrote:

On 9/4/19 1:25 PM, ToddAndMargo via users wrote:
> On 9/4/19 2:44 AM, Patrick O'Callaghan wrote:
>> The point of Eyal's method is to ensure that all the free space on the
>> drive is filled with zeroes, thus improving the compression. Otherwise
>> you are just uselessly compressing junk.
>>
>> poc
>
> Is there a way to tell the stick itself to zero out
> all unused space?

This sounds like what I need:

https://manpages.ubuntu.com/manpages/trusty/man8/zerofree.8.html

Am I on the right track?

-T
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