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<font size="+1"><font face="Times New Roman, Times, serif">The -S
was advised by a member of the Fedora Users Mailing List,<br>
and I thought I would try it.<br>
I still have the original disk, so no permanent harm.<br>
I keep trying what is suggested on a copy of the partition.<br>
<br>
Only drag is the copying :)<br>
It is a 400GiB partition (400 * 1024^3).<br>
<br>
I am currently scanning the parition for a superblock, starting
at -b 0,<br>
and keep incrementing by 512, until I find what"might be" a
superblock;<br>
i.e. fsck does not say "Bad magic number". Of course, that's no
guarantee<br>
it is a superblock, but it gives me an opportunity to examine
the superblock<br>
at that offset.<br>
<br>
Regards,<br>
<br>
JD<br>
<br>
<br>
</font></font>
<div class="moz-cite-prefix">On 09/20/2014 12:14 PM, Theodore Ts'o
wrote:<br>
</div>
<blockquote cite="mid:20140920181432.GB14788@thunk.org" type="cite">
<pre wrap="">On Fri, Sep 19, 2014 at 07:56:37PM -0600, jd1008 wrote:
</pre>
<blockquote type="cite">
<pre wrap="">I am reporting this on the advice of the Fedora Users Mailing List Member.
This the mailing list exchange outlining the problem with specifying -S to
mkfs,
and it's subsequent consequences when fsck is run.
</pre>
</blockquote>
<pre wrap="">
If none of the possible superblocks are valid when using mke2fs -b
<NNN>, there's a good chance that your partition table (or LVM
metadata) has gotten corrupted. You should definitely check to make
sure the partition setup is sane before trying to use mke2fs -S.
It's also true, as Andreas has stated, that with the large number of
new file system options and layouts with ext4, mke2fs -S is much more
hazardous unless you __really__ know what you are doing. It would
probably be a good idea to have some warning messages to that effect
in the man page.
- Ted
</pre>
</blockquote>
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