Nope, never heard of before!
This works great, even without changing permissions or owner if the files.
So if I want to make all the files uneditable, can I run this command?
find /mnt/disk1/Media/ -type f -exec chattr +i "{}" \;
find /mnt/disk2/Media/ -type f -exec chattr +i "{}" \;
And If I need to edit the files again, I run this command?
find /mnt/disk1/Media/ -type f -exec chattr -i "{}" \;
find /mnt/disk2/Media/ -type f -exec chattr -i "{}" \;
There is no need to do this on folder too? I could at least not delete any folders with a file that is immutable.