udev device names
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If you need to address the device itself, they will not do. Modern Linux distributions have an alternative. This alternative is created by the udev process, which is started on all modern Linux distributions automatically.
udev is the process that detects device changes on the hardware bus and is responsible for creating device names.
Not only does it create the device names /dev/sdb and so on, but for each storage device it also creates a unique device name in the directory /dev/disk.
the udev device names are all symbolic links, and shows you what device these links are referring to, see ls -RL /dev/disk
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