Re: Help with ddrescue
On Fri, 08 May 2015 16:51:20 -0400
The Wanderer <wanderer@fastmail.fm> wrote:
> On 05/08/2015 at 04:34 PM, German wrote:
>
> > On Fri, 08 May 2015 16:27:22 -0400 The Wanderer
> > <wanderer@fastmail.fm> wrote:
>
> >> What leads you to conclude that the drive is OK and the filesystem
> >> is what is bad? What errors are you seeing, in what situations?
> >
> > Error mounting /dev/sdc1 at /media/spore/FreeAgent GoFlex Drive:
> > Command-line `mount -t "ntfs" -o
> > "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177"
> > "/dev/sdc1" "/media/spore/FreeAgent GoFlex Drive"' exited with
> > non-zero exit status 13: ntfs_attr_pread_i: ntfs_pread failed:
> > Input/output error Failed to read of MFT, mft=17625 count=1 br=-1:
> > Input/output error Inode is corrupt (5): Input/output error Index
> > root attribute missing in directory inode 5: Input/output error
> > Failed to mount '/dev/sdc1': Input/output error
>
> "Input/output error" in this sort of context usually means that the
> drive itself is failing, not the filesystem. (Or that something else
> in the connection between the system and the drive is faulty; I've
> seen it happen with bad SATA/IDE cables, and for that matter with
> cables which were just loose.)
>
> Just to confirm, this happens on any mount attempt, correct?
Yes, this happens on mount attempt. I still don't think that drive is
failing and I think cables are ok too. It's happened when I was
installing Lubuntu. During the install, install program obviously
probed all available drives, and did something nasty to the drive.
>
> > NTFS is either inconsistent, or there is a hardware fault, or it's a
> > SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on
> > Windows then reboot into Windows twice. The usage of the /f
> > parameter is very important! If the device is a SoftRAID/FakeRAID
> > then first activate it and mount a different device under
> > the /dev/mapper/ directory, (e.g. /dev/mapper/nvidia_eahaabcc1).
> > Please see the 'dmraid' documentation for more details.
>
> If you have a suitable Windows system with which to try the suggested
> 'chkdsk /f' and double reboot-into-Windows approach, you could do
> that, but I wouldn't bet on it helping - and if the drive really is
> failing, then trying to access the drive that way might make things
> worse.
>
> I think it looks as if the drive really is failing, and the "separate,
> larger drive" ddrescue/dd_rescue/myrescue approach is the right way to
> go after all.
>
> (Also note that since the filesystem is on /dev/sdc1, you'll almost
> certainly want to apply your ddrescue command to source that node, not
> the higher-level /dev/sdc node. You _can_ recover the data from a copy
> of /dev/sdc, but it's significantly less trivial.)
>
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