sda2 is corrupted

[Reindl Harald]

Am 06.07.2012 18:11, schrieb Jim:
> On 07/06/2012 12:02 PM, Michael Schwendt wrote:
>> On Fri, 06 Jul 2012 11:22:55 -0400, Jim wrote:
>>
>>>>> /dev/sdb1 is now a blockwise copy of /dev/sda2
>>>> On 05.07.2012, Jim wrote:
>>>>
>>>>> There are some important data files  I must save off of sda2
>>>> Before you start any rescueing, take a full snapshot of the partition,
>>>> e.g. "dd if=/dev/sda2 of=/dev/on_an_external_disk"
>>>>
>>> that is exactly what I did but nothing shows up on /dev/sdb1 external
>>> drive after dd has completed .
>> That makes no sense. If /dev/sdb1 points at a corrupted filesystem,
>> above "dd" command will copy the same corrupted filesystem to /dev/sda2.
>> That's expected and okay, if you only want to keep that one read-only as
>> a backup of the originally corrupted filesystem. Then you can play with
>> rescueing sdb1 - but be careful and remember that sda2 is supposed to be
>> your backup of a corrupted filesystem. Don't mess with that one.
>>
>> Better would have been to copy sdb1 to an image file instead of another
>> partition device.
>>
> sda2 is the corrupted file system.
> I'm trying to send a img of the sda2 to backup hard drive sdb1

but you did sent the command to overwrite the whole partition
AND NOT a image some posts before!

> I' running into a read-only filisystem on sda3 , but :
> 
> # mount | grep sda3
> /dev/sda3 on / type ext4 (rw,relatime,seclabel,data=ordered)

what role does play sda3 in this game now?

> it say it is rw but when i run the dd command i get a read-only filesystem

what role does play sda3 mounted as rootfs for the dd-command
and why should dd write to this drive?

A LAST TIME:

provide UNCUTTED inputs and outputs if you need help
as also FULL information what are you trying to do
and not only what you think is the solution

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