blkid
# blkid
/dev/mmcblk0p1: LABEL="boot" UUID="70CI-CB26" TYPE="vfat" PARTUUID="e3cbft8b-01"
/dev/mmcblk0p2: UUID="f2100b2f-ed84-4647-b5ai-081234512716" TYPE="ext4" PARTUUID="e3cbfe8b-02"
/dev/sda1: UUID="ab34fc7c-0f1c-1234-5678-9f9f7065e672" TYPE="ext4" PARTUUID="6b905dde-01"
/dev/mmcblk0: PTUUID="e3fdfe4b" PTTYPE="dos"
/dev/sda1 UUID="ab34fc7c-0f1c-1234-5678-9f9f7065e672"
add /etc/fstab
UUID=ab34fc7c-0f1c-1234-5678-9f9f7065e672 /mnt ext4 defaults,noatime,auto 0 0
También
ls -l /dev/disk/by-uuid/
Da los UIDs