I don't see an option to mount 2 of my hard drives

[freggel.doe]

[root tip] [How To] Use systemd to mount ANY device

Difficulty: ★☆☆☆☆ Disk device recognition Manjaro uses udev (see Arch Wiki) to load devices at boot time. The loading of devices is arbitrary and therefore you cannot predict which device will be available at a given path. But static device names do exist and you can assign specific locations to your device and thus ensure e.g. scripts will work as expected. What to learn Overview of system mount units Structure and Content of a mount unit Mount at boot (immediate mount) Mount on demand (m…

Do you have any mountable partitions/filesystem on those two drives?
Please post output of

$ lsblk -fs
$ parted -l