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  • Start with parted -l or fdisk -l. Do they show you the increased disk (not fs) size on the first disk, and the second empty disk? This command will also help you: lsblk -o name,fstype,size,fssize,mountpoint,label,model,vendor Post the output of the commands and I'll add to the answer how you should proceed. Commented Sep 18, 2020 at 20:50
  • By adding another disk you've simply made a new device usable on the system, you haven't expanded your storage on the root drive (sdb is your 'new drive')Nor have you expanded the partition first so that it can use the excess space on the disk. Commented Sep 18, 2020 at 22:53