Testdisk sees what ddrescue does not
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Testdisk sees what ddrescue does not
by Ken A Scott
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I have a troubled disk which won't mount in Linux (or boot up to XP which is what it is). The 'testdisk' utility correctly indentifies the partitions
(a large 233GB NTFS Windows partition and a small 11GB recovery partition => total size 250GB)
and can show actual files on on the windows partition but can't write the partition table to the disk. ddrescue 1.2-1.3 (on a MEPIS system) with the following command $ddrescue --no-split /dev/sdb1 imagefile logfile
says
'cannot open input file:No such file or directory'
Since cat /proc/partitions shows a sdb entry '8 16 244198584' I was able to start the above command with just
$ddrescue --no-split /dev/sdb imagefile logfile
but I'm not sure if it is useful (since I know there to be actually two partitions there).
Any advice?
Thanks in advance!
Ken
-- Ken A Scott kscott9@... _______________________________________________ Bug-ddrescue mailing list Bug-ddrescue@... http://lists.gnu.org/mailman/listinfo/bug-ddrescue |
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Re: Testdisk sees what ddrescue does not
by Antonio Diaz Diaz-2
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| It's far from useless. You can image the drive and mount the partition on the image using an offset. Assuming you imaged the drive (sdb) to a file named "image" in the current directory, you can do: mkdir mnt sudo mount -t ntfs -o r,loop,offset=32256 file mntSee here for more details:https://help.ubuntu.com/community/DataRecovery#Mounting%20partitions%20on%20the%20image --- On Fri, 6/12/09, Ken A Scott <kscott9@...> wrote:
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Re: Testdisk sees what ddrescue does not
by Ken A Scott
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Hi guys,
Thanks for the help and encouragement. The imaging of the drive is going well (saved ~45 Gb so far with less 1% errors and clipping along at about 1MB per sec after I added -c 64 and -d qualifiers to ddrescue) . Given that the entire drive 250GB was not close to full the question is can I stop ddrescue at some point, make a copy of what I have so far, and perform testdisk, fsck, and mount etc. to that copy?
I know that would cost me whatever data might have been spread out into the last unimaged portion of the original NTFS partition but would it even work?
In other words, can effective repairs be performed on a image of a portion of a NTFS partition?
Even if this idea is faulty I can always resume the ddrescue where I left off.
Thanks
Ken
On Sun, 14 Jun 2009 09:30 -0700, "andrew zajac" <arzajac@...> wrote:
It's far from useless. You can image the drive and mount the partition on the image using an offset.
Assuming you imaged the drive (sdb) to a file named "image" in the current directory, you can do:
mkdir mnt
sudo mount -t ntfs -o r,loop,offset=32256 file mntSee here for more details:
https://help.ubuntu.com/community/DataRecovery#Mounting%20partitions%20on%20the%20image
--- On Fri, 6/12/09, Ken A Scott <kscott9@...> wrote:
From: Ken A Scott <kscott9@...>
Subject: [Bug-ddrescue] Testdisk sees what ddrescue does not
To: Bug-ddrescue@...
Received: Friday, June 12, 2009, 2:45 PM
I have a troubled disk which won't mount in Linux (or boot up to XP which is what it is). The 'testdisk' utility correctly indentifies the partitions(a large 233GB NTFS Windows partition and a small 11GB recovery partition => total size 250GB)and can show actual files on on the windows partition but can't write the partition table to the disk. ddrescue 1.2-1.3 (on a MEPIS system) with the following command $ddrescue --no-split /dev/sdb1 imagefile logfilesays'cannot open input file:No such file or directory'Since cat /proc/partitions shows a sdb entry '8 16 244198584' I was able to start the above command with just$ddrescue --no-split /dev/sdb imagefile logfilebut I'm not sure if it is useful (since I know there to be actually two partitions there).Any advice?Thanks in advance!Ken-- Ken A Scott kscott9@...
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Re: Testdisk sees what ddrescue does not
by andrew zajac-2
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| I try not to interrupt a rescue that is spitting out data unless I have a really good reason to do so. There's lots you can do without writing to the image, though. If you mount the image as read-only then you can attempt to read some files from it right now, on-the-fly, without writing to it with Testdisk. But I certainly would not try to repair the filesystem at this point. --- On Sun, 6/14/09, Ken A Scott <kscott9@...> wrote:
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