[CentOS] Utility to zero unused blocks on disk

[Digimer]

Personally, I just do 'dd if=/dev/zero of=/path/to/zero.img bs=1M; rm -f
/path/to/zero.img'. It's inelegant, for sure, but it works (note to run
it as a normal user or else be careful of how your system reacts to
running out of disk space for a moment).

fix-it-with-a-hammer-digimer

On 08/02/16 04:34 PM, 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.
> 
> thanks,
> 
> -wes
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