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@xxxxxxxxx> 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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