[NCLUG] file system damage from dd with of=<a drive in my file system>

[Ray Frush]

Vincent-

From the information you’ve provided, it’s not clear what damage was done.

/dev/sdb1 is not directly mounted (from df -h),  so unless it’s part of the ‘rhel-root’ volume group, you’re probably fine.

The output from ‘vgdisplay’ and ‘lvdisplay’ would confirm if /dev/sdb1 is included in the LVM config, but I suspect that it is not.

If my guess is correct, you wrote over an unused partition on your system.


> On 22 Nov 2015, at 2:15 AM, Vincent Randal <vtrandal at gmail.com> wrote:
> 
> Hello nclug friends,
> 
> I'm wondering what damage I have done to my laptop's file system as a
> result of running dd with "of="  set to a drive that is part of the file
> system. I'm not exactly sure how the file systems is setup. During
> installation I chose to install RHEL 7.2 to both ssd's in the laptop. The
> output of ls -la /dev/sd* and df -h might help.
> 
> ls -la /dev/sd*
> brw-rw----. 1 root disk 8,  0 Nov 20 20:35 /dev/sda
> brw-rw----. 1 root disk 8,  1 Nov 20 20:35 /dev/sda1
> brw-rw----. 1 root disk 8,  2 Nov 20 20:35 /dev/sda2
> brw-rw----. 1 root disk 8, 16 Nov 22 01:06 /dev/sdb
> brw-rw----. 1 root disk 8, 17 Nov 22 01:06 /dev/sdb1
> 
> df -h
> Filesystem             Size  Used Avail Use% Mounted on
> /dev/mapper/rhel-root  216G  5.4G  211G   3% /
> devtmpfs               7.8G     0  7.8G   0% /dev
> tmpfs                  7.8G  188K  7.8G   1% /dev/shm
> tmpfs                  7.8G   18M  7.8G   1% /run
> tmpfs                  7.8G     0  7.8G   0% /sys/fs/cgroup
> /dev/sda1             1014M  166M  849M  17% /boot
> /dev/mapper/rhel-home  476G   49G  428G  11% /home
> tmpfs                  1.6G   36K  1.6G   1% /run/user/1000
> 
> The dd command that I am worried did some damage was like this one:
> dd if=ubuntu-14.04.3-desktop-amd64.iso dd=/dev/sdb bs=10M
> 
> Here's the output from ls -la ubuntu-14.04.3-desktop-amd64.iso in case the
> size of "if=" matters:
> -rw-rw-r--. 1 vtrandal vtrandal 794820608 Nov 22 01:03
> ubuntu-12.04.5-desktop-amd64.iso
> 
> Should I reinstall and be more careful or is there a way to fix the damage?
> 
> I'm assuming I damaged the file system. I really can't see how this did not
> mess things up.
> 
> Regards,
> 
> Vincent Randal
> Longmont, Colorado
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