MinimServer: no valid content directory found

[simoncn]

I have done this test and it is working for me. My second drive is formatted as Master Boot Record, Contents Ext4, Partition Linux (Bootable). From your screenshot, your drive is GUID Partition Table, Contents Unknown, Partition Type Microsoft Reserved. Also, the partition is only 17 MB in size.

I suggest you reformat the 2TB disk from scratch as a 2TB Ext4 partition, removing all current contents and copying them back after the reformat.