[Linux-disciples] Erasing a device node

[Adam Rosi-Kessel]

When that wrapping thing happens, can you usually fix it with resize
and/or reset. It's usually a consequence of having resized your xterm
after starting.

To see if you've written that file, you could try reversing if and of and
changing seek to skip,

sudo dd if=/dev/hdd1 of=/dev/null bs=4096 count=1 skip=47136440

See if you get a disk error.  (be careful swapping seek and skip; I've
accidentally written to the wrong area of the disk by confusing them
before).

In the past, I've had to repeatedly zero out the bad error.  I also think
I eventually manually told e2fsck which block was bad and then after that
was able to do a successful smartctl long test.

On Sat, Dec 04, 2004 at 01:09:24PM -0500, Stephen R Laniel wrote:
> I was just following the directions to clear a bad sector
> [1], and I got to this step:
> 
> dd if=/dev/zero of=/dev/hda3 bs=4096 count=1 seek=2269012
> 
> Of course I replaced /dev/hda3 with my own partition
> (/dev/hdd1), and replaced the 'seek=' argument with the
> block number of my own bad block. But as I was typing it in,
> bash did something weird where it started writing my command
> at the beginning of the command line rather than at the end;
> the final command line ended up looking like
> 
> seek=47136440el at JeffTweedy:~$ sudo dd if=/dev/zero of=/dev/hdd1 bs=4096 count=1 s
> 
> Consequently, I'm not sure whether the 'dd' command went
> through correctly. It gave me some output saying that it had
> written one 4,096-byte record (I've unfortunately not saved
> the output) ... so, should I assume it's written the correct
> data? How could I check whether it has? If it didn't write
> correctly, what would I expect to have happen? Might it have
> written a block of zeroes to some unknown file?
> 
> I tried downloading the file that sits on that sector, and I
> got a read error. So I ran dd again, this time making sure
> that the right arguments went in. Now I get no read errors.
> So it looks like it didn't fix the right file the first
> time, but now it has.
> 
> What should I make of all this? Am I going to be screwed at
> some point? Should I just mknod /dev/hdd?
> 
> [1] - http://shorl.com/fidrugripiprele
> 

> -- 
> ``But now it's just another show
>   You leave them laughing when you go
>   And if you care, don't let them know
>   Don't give yourself away.''
>  -Joni Mitchell, "Both Sides Now"
> 
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-- 
Adam Rosi-Kessel
http://adam.rosi-kessel.org
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