So, we have Linux, and we want to find out the UUID of some connected disk. Looking in /dev/disks... won't work, since partitions can appear not only after a system reboot, but can also be attached online, right while the OS is running. For example, this is how we can attach iSCSI disks, etc.
To find out the UUID of any disk, you just need one small, simple command:
$ sudo blkid
In response you'll see something like this:
/dev/xvda3: LABEL="/" UUID="13abb28c-cf37-481b-bf3d-9df1f30adc3e" TYPE="ext3"
/dev/xvda2: LABEL="SWAP-xvda2" TYPE="swap"
/dev/xvda1: LABEL="/boot" UUID="82f2bd4b-ece2-4a4b-8506-dbe7bd02506b" TYPE="ext3"
/dev/xvdb1: UUID="e9bcdb18-2f8d-4ca9-bfe1-f6ce05400666" TYPE="ext3"
From here everything is clear - the correspondence between the UUID and the device file in /dev.
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