`/proc/devices` - List of device drivers configured into the currently running kernel (block and character)

 - [/proc/devices](https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/4/html/Reference_Guide/s2-proc-devices.html)

`/dev` - This directory contains the special device files for all the devices

 - [/dev](http://www.tldp.org/LDP/sag/html/dev-fs.html)

> Difference between [procfs vs sysfs](http://unix.stackexchange.com/questions/4884/what-is-the-difference-between-procfs-and-sysfs)