[CentOS] Utility to zero unused blocks on disk

hdparm supports ATA secure erase. This is SSD safe, unlike other options.
It's faster than writing zeros to both HDD and SSD.

Chris Murphy

On Mon, Feb 8, 2016, 3:06 PM  <m.roth at 5-cent.us> wrote:

> Wes James wrote:
> > Is there a utility to zero unused blocks on a disk?
> >
> > CentOS 6.7/Ext4
> >
> > I saw zerofree, but I’m not sure it would work on Ext4 or even work on
> > this version of CentOS.
> >
> I don't understand the point of doing this. If you want to sanitize the
> disk, use dban <dban.org>, which surely approaches industry standard for
> the open source answer.
>
> Just zeroing random blocks? Why? If you want to wipe a specific file,
> there's shred.
>
>        mark
>
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