mjhjmtu

I have partially overwritten my system disk with a copy of CentOS-7-x86_64-DVD-1708.iso (wrong /dev/sdX in the dd command). I since recovered from this and I notice that in Ubuntu 16.04 /dev/sdb1 (which is in fact a swap partition and should not have a name) is given the name "CentOS 7 x86_64":

$ ls -l /dev/disk/by-label/ 
total 0
lrwxrwxrwx 1 root root 10 May 4 12:29 Backup -> ../../sda2
lrwxrwxrwx 1 root root 10 May 4 12:29 centos7 -> ../../sdb2
lrwxrwxrwx 1 root root 10 May 4 12:29 CentOSx207x20x86_64 -> ../../sdb1 <===== ? swap partition
lrwxrwxrwx 1 root root 10 May 4 12:29 data -> ../../sdb5
lrwxrwxrwx 1 root root 10 May 4 12:29 Data -> ../../sda1
lrwxrwxrwx 1 root root 10 May 4 12:29 ubuntu -> ../../sdb3

I have an Ubuntu 14.04 on another drive which also assigns this name to a partition on drive /dev/sdb :

$ ls -l /dev/disk/by-label/
total 0
lrwxrwxrwx 1 root root 10 May 4 14:16 Backup -> ../../sda2
lrwxrwxrwx 1 root root 10 May 4 14:16 centos7 -> ../../sdb2
lrwxrwxrwx 1 root root 10 May 4 14:16 CentOSx207x20x86_64 -> ../../sdb4 <=== ? extended partition
lrwxrwxrwx 1 root root 10 May 4 14:16 data -> ../../sdb5
lrwxrwxrwx 1 root root 10 May 4 14:16 Data -> ../../sda1
lrwxrwxrwx 1 root root 10 May 4 14:16 ubuntu -> ../../sdb3

This time it is /dev/sdb4 which the extended partition container and hence should not have any name either.

Search as I may I did not find where this names comes from and how to get rid of it.

The trouble is that when I try to install a CentOS 7 (from a USB key) the installer scripts looks for a disk labeled "CentOS 7 x86_64" and picks a partition on /dev/sdb rather than the USB key (which is at /dev/sdc in my system).

Come someone help me to solve this issue ?
Thanks.

If /dev/sdb1 is a swap parition, then you can update the label using mkswap. This will re-format the swap partition; there may be other options to avoid that:

# swapoff /dev/sdb1
# mkswap -L swap_part /dev/sdb1
# swapof /dev/sdb1

Here, 'swap_part' is the new label:

$ ls -l /dev/disk/by-label
...
lrwxrwxrwx 1 root root 9 May 8 09:32 swap_part -> ../../sdb1
...

If you want to remove the label all together, you can set it to the empty string:

# mkswap -L "" /dev/sdb1