Partition/Volume grayed out but full read/write access i have a Mac Server and a partition only for files. The volume is grayed out in the Finder sidebar, but if i go to the folder via CMD + G (go to folder) and type "/Volumes/Server_Daten" the volume opens and i can read and write. If i go to informations (CMD + ALT + I) i can't change the permissions (little lock symbol is grayed out too).

I have the root user enabled, but even as root i can't change the permissions and have to go to the folder via CMD + G.

How can i fix the grayed out volume in the sidebar?
I figured it out:

The partition was hidden (i don't know why...) so i made it visible again:

chflags nohidden /Volumes/MY_PARTITION