Know that my chances are small (if even there are :().
I have a HDD of 500G with 1 logical volume (ext4). By accident I overwrote it with an ISO of 1,5G:
dd if=linuxmint-18-xfce-32bit.iso of=/dev/sdb
Now I lost all data. Is there some way to re-create the logical volume to get some data back? I have the LVM backup file.
The HDD was used as system disk until 1 month ago. Then I added the boot and swap partition to the logical volume so I presume that
dd only overwrote the space that was used by these partitions.