/sys/*
Virtual file system provided by the Linux kernel, exporting all
currently known devices. This information is used by udev to create
device nodes in /dev
/dev/*
Dynamically created device nodes and static content copied at boot
time from /lib/udev/devices/*
The following files and directories contain the crucial elements of the udev infrastructure:
/etc/udev/udev.conf
Main udev configuration file.
/etc/udev/rules.d/*
udev event matching rules.
/lib/udev/devices/*
Static /dev content.
/lib/udev/*
Helper programs called from udev rules.