linux-ext4 - Re: linux ext3 partition hosed, is this hardware of software error?

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Date:	Sun, 21 Dec 2008 15:57:20 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Norbert Preining <preining@...ic.at>
Cc:	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: linux ext3 partition hosed, is this hardware of software error?

> > > Buffer I/O error on device sda3, logical block 12
> > > Buffer I/O error on device sda3, logical block 13
> > 
> > Right near the start of the disk.
> 
> Ah, that is the reason why grub is gone.

To be accurate - start of partition but the effect is the same yes.

> > Make a copy of the partition with a recovery tool and write it somewhere
> 
> ddrescue? partimage? Any other suggestion?

ddrescue should do the trick - anything which will copy all the valid
sectors and write out the lost ones as zero or similar preserving what is
left of the file.

> 
> > (file on another disk whatever) and keep it safe. Make a copy of that and
> > fsck the copy. You may need to use the alternate superblock option on
> > fsck for this.
> 
> Thanks, good hint, didn't know about that.

It's there for exactly this kind of situation.

Alan
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