On 02/08/2016 03:05 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. Wes didn't say the reason he wanted to zero unused blocks, but I always do this in kickstart scripts when constructing VM images as the image size is considerably reduced by doing this... -Greg