Assign one USB-storage device to one device file
I have several USB-storage devices that I regularly use (camera, cardreaders, usb-discs ...).
They all work fine but they always get a different device-file depending on the order I plug them in.
So how can I make sure that my camere for example is always on /dev/sda, my hard-discs on /dev/sdb and /dev/sdc, no matter when or in which order I plug them into my PC to make it easier to maintain them in /etc/fstab?
Is that even possible at all?