On 5 Apr 2018 at 8:36, Samuel Sieb wrote:
Subject: Re: OT:Question on NVME disk direct access?
To: users(a)lists.fedoraproject.org
From: Samuel Sieb <samuel(a)sieb.net>
Date sent: Thu, 5 Apr 2018 08:36:20 -0700
Send reply to: Community support for Fedora users
<users(a)lists.fedoraproject.org>
On 04/05/2018 12:59 AM, Todd Chester wrote:
> If you what to completely blank a disk out, don't mess around with that
> operating system whose name I shall not mention. (I hear it is slow,
> buggy, and expensive.) Stay in Linux.
>
> # dd bs=1M if=/dev/zero of=/dev/sdx
If I understood the original post correctly, the person was wanting to
blank the free space, not erase the whole disk. The problem was that
the program used was a secure eraser which filled the blank space with
random data which doesn't compress.
It has now been confirmed that is the case. The user has used the G4L
included cleaning options for the free space on the partitions, and is seeing a
compression rate of close to 90%. The Eraser programs current
documentation online seems to show default option is a security erase rather
than a clearing out with zeroing. Program does have an option for that, but
not default.
G4L creates a 0bits file that it writes nulls to, until the partition is full and then
deletes file. With Fat32 partitions, it creats multiple 2G files till partition full,
and then deletes them. It doesn't blank out disks or partitions. Exception is
for swap partition of linux, where it does get blkid info of partition, then zeros
out partitions, and recreates the swap partition with same blkid info.
Thanks.
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