Best way of installing and configuring MiniDLNA on Manjaro?

That is not a label.

  • sdb means → Serial Disk B
  • sdb1 means → Serial Disk B Partition 1

So clearly: /dev/sdb is the whole disk. /dev/sdb1 is the first Partition of the second Disk.

The disk must be mounted into a folder.

Example:

mount /dev/sdb1 /mnt

Please read the link for more explanations: