Ubuntu system corrupted

Petter Adsen petter at synth.no
Thu May 28 11:21:25 UTC 2015


On Thu, 28 May 2015 06:37:13 -0400
Istimsak Abdulbasir <saqman2060 at gmail.com> wrote:

> On Thu, May 28, 2015 at 5:28 AM, Hari <hariraghaveee at gmail.com> wrote:
> 
> > Thanks a lot Nils for a early reply. Yea seems like that only. Even
> > i thought so. Let me see
> >
> > Peter , thanks for your reply too.. Yes i now understand and
> > realise the value of backups. How do i make a image of the broken
> > file system ? I am not having so much expertise. Could u guide me ?
> > Thanks in advance
> >
> > Since you started using the "dd" command lets teach you how to use
> > it
> properly. First thing you need is an extra drive that is bigger than
> the one you are cloning. Get your hands on a liveCD of ubuntu, any
> flavor will do. Make sure two disk utilities are available, gparted
> and disk utility. Gparted will allow you to easily format a disk.
> Disk utility will allow you to do the same but is not as visually
> friendly as gparted.
> 
> In your liveCD make sure both disks, your primary one and the backup
> disks are mounted. Create a folder in the second drive which will be
> used to store the image.
> 
> Read this documentation on how to use "dd".
> https://help.ubuntu.com/community/DriveImaging
> 
> If you have two drives installed in your system, they will have these
> names, /dev/sda and /dev/sdb. If they have partitions they will be
> /dev/sda1 or /dev/sdb1 with one meaning partition one. What you will
> be using is cloning /dev/sda to the folder residing in your second
> hard drive.

No, you don't. Only one file system was corrupted, so that's all he
wants to image. Making an image of the entire disk in this scenario
would just require more space than is necessary and
potentially complicate things.

If /dev/sda2 is the Linux filesystem, you want to do something like
this (from a live disk, for example):

sudo if=/dev/sda2 of=/path/to/file.img bs=128M

After that finishes, run for example testdisk or whatever recovery tool
you choose on the image file. You will also need somewhere to store the
recovered data.

Petter

-- 
"I'm ionized"
"Are you sure?"
"I'm positive."
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