On 5 Apr 2018 at 9:58, ToddAndMargo wrote:
Subject: Re: OT:Question on NVME disk direct access?
To: users(a)lists.fedoraproject.org
From: ToddAndMargo <ToddAndMargo(a)zoho.com>
Date sent: Thu, 5 Apr 2018 09:58:34 -0700
Send reply to: Community support for Fedora users
<users(a)lists.fedoraproject.org>
On 04/05/2018 08:36 AM, Samuel Sieb wrote:
> 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.
CLone Zilla skips over data that is not allocated, unless
your are LUKS encrypted. Goes like the wind!
There are various options with programs. At the bit level imaging for a bare
image restore, the OS of the disk are partition is not used, so it is just reading
the raw data of all the sectors, so that a single pass restore gives everything.
If one uses an option to access the data at the OS level, it can determine
what is used or not. G4L includes ntfsclone for windows paritions, and
fsarchiver for that and others, and it can backup data only, and is faster.
Also, has options to change size of partitions. Bit level restores exactly the
same size, but can be resized by other utilities afterwards.
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