What is the "device" argument in the mount command?
I know that if you want to mount a device from the /dev directory, you can do a simple command like
mount /dev/cdrom /media/cdrom
What I don't understand is how mount knows about the special stuff like proc and sysfs. They are not devices in the /dev directory.
I've seen the command
mount -t tmpfs mdev /dev referenced when looking at busybox docs. Where is this mdev "device"?