I would suggest reading the USB docs in these links:
http://www.kernel.org/pub/linux/utils/kernel/hotplug/udev.html
It is convenient to use persistence to ensure that all removable USB devices
retain their name regardless of how many times you plug them in and remove
them. This also allows you to make fstab entries so that any user can, for
example, mount your digital camera to download the pictures. You will run into
naming problems if the previous device is still in use even if the device node
had been removed, but in that case you should be asking yourself what's keeping
the device open. Without using the persistent naming mechanism, your 'sd?'
assignments will be based solely on the order in which you happened to plug
things in - like USB stick or camera first.
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