The new HD you got online finally arrived. After you open your computer and install it (and after looking for badblocks), you’ll need to mount it automatically on boot.
Type lsblk or mount to find the device (or dmesg if you’re brave). In my case, it was /dev/sdb1
/dev/sdb1 on /media/dth/HD2 type ext4 (rw,nosuid,nodev,relatime,data=ordered,uhelper=udisks2)
Now get the device’s UUID and type with blkid
/dev/sdb1: LABEL="HD2" UUID="0d256b26-1782-4f3f-b192-468464DjhdS7" TYPE="ext4" PARTUUID="290cdbb5-01"