I have an external hard-disk, connected by usb. Because it is external, the /dev file for it is in group floppy. However I use it as if it is internal. I also sometimes format sd cards and other usb devices, I am in group floppy to do this. I do not want to accidentally format this hard-disk, so do not want it to be in group floppy.
How can I configure it to be in a different group. It is currently managed by udev. I have not been able to figure out how to configure udev.
I am using Debian 7 (Wheezy)