By convention, a GNU/Linux system includes a directory /dev containing the full
complement of character and block device entries for devices that Linux knows about.
Entries in /dev have standardized names corresponding to major and minor device
numbers.
$ ls -l /dev/hda /dev/hda1
$ ls -l /dev/lp0
In most cases, you should not use mknod to create your own device entries. Use the entries in /dev instead.