Three ways to view UUID under Linux and the role of using UUID

Three ways to view the UUID of a device are summarized below:

1 Command view: Blkid
2 file Views: Ls-l/dev/disk/by-uuid
3 Command view: VOL_ID/DEV/SDA1

The role and significance of UUID

1: It's really the only sign

The UUID provides a unique identification string for the storage device in the system, regardless of the type of device. If you start up in the system and use a drive letter mount, you may not find the device and the load fails, and when you use the UUID mount, there is no such problem.

2: Device name is not always the same

Automatically assigned device names are not always consistent, and they depend on the order in which the kernel loads the modules at startup. If you start the system when you plug in a USB drive and then unplug it the next time you start it, you may have inconsistent device name assignments.

Using the UUID is also good for mounting a mobile device, which supports a wide variety of cards, while the use of UUID always allows the same card to be mounted in the same place.
Many of the key features in 3:ubuntu are now dependent on UUID

This article from "Tiger's Technical Homeland" blog, declined reprint!