sda2 is corrupted

[Mark C. Allman]

On Thu, 2012-07-05 at 14:43 -0400, Mark C. Allman wrote:
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> On Thu, 2012-07-05 at 14:30 -0400, Jim wrote:
> > On 07/05/2012 02:13 PM, Mark C. Allman wrote:
> > > On Thu, 2012-07-05 at 13:47 -0400, Jim wrote:
> > >> On 07/05/2012 01:23 PM, Mateusz Marzantowicz wrote:
> > >>> On 05.07.2012 19:15, Jim wrote:
> > >>>> Fedora 17
> > >>>>
> > >>>> the sda2 /home is corruoted and it changed /home partitiion to UNKNOWN
> > >>>> and it won't let me change the label back to /home
> > >>>>
> > >>>> I have tried to use fedora and Gparted with no luck.
> > >>>>
> > >>>> There are some important data files  I must save off of sda2
> > >>>>
> > >>>>
> > >>> 1. What is the type of that file system?
> > >> ext4
> > >>> 2. Can you paste error messages related to this partition?
> > >> No , Gparted can not mount it either
> > >>> 3. What happens after system reboot? Does it mount or not?
> > >> No , only  / is mounted
> > >>>
> > >>> Mateusz Marzantowicz
> > >>
> > > So when the system reboots you see a /dev/sda2 device, correct?
> > >
> > > When you type "mount /dev/sda2 /somewhere" (where "somewhere" is some
> > > existing, handy mount point) you get an error message saying that the
> > > file system isn't recognized or can't be determined?
> > >
> > > If you type "mount -t ext4 /dev/sda2 /somewhere" you get an error
> > > message, e.g., "not an ext4 filesystem?"
> > >
> > > What I would try next is running "e2fsck -n /dev/sda2" and see what that
> > > says.  The "-n" to insure nothing is written to the disk (just in case).
> > > Try it and post the results to the list here.  The partition superblock
> > > may be corrupted and I have no idea what e2fsck will try to do if that's
> > > the case.  It may just give up without looking at the backup superblock.
> > >
> >   # e2fsck -n /dev/sda2
> > e2fsck 1.42 (29-Nov-2011)
> > e2fsck: Superblock invalid, trying backup blocks...
> > Superblock has an invalid journal (inode 8).
> > Clear? no
> > 
> > e2fsck: Illegal inode number while checking ext3 journal for /home
> > 
> > /home: ********** WARNING: Filesystem still has errors **********
> > 
> > 
> 
> Before you do anything else I would definitely make the backup copy of
> the partition as suggested earlier in another post using "dd."
> 
> At this point I defer to the disk partition wizards on the list.  I have
> no idea what would happen if you were to remove the "-n" switch and tell
> e2fsck to clear the journal.  If I read the output from e2fsck right it
> looks like a backup superblock was found (which is good, I'd think).
> 
> -- 
> Mark C. Allman, PMP, CSM
> Founder, See How You Ski
> Allman Professional Consulting, Inc., www.allmanpc.com
> 617-947-4263, Twitter:  @allmanpc
> 

Whoops!  Sorry about not snipping off all of the header at the top of my
last post.

-- Mark