Mac OS set some folders to invisible. If you need to access from UI, these folder invisibility must be set to no hidden.

I show you how easy to set the folder invisibility

In this scenario, I would like to show folder Volumes and it is hidden in UI.

 

To set the folder invisibility, you need to open Terminal and issue the following command:

#sudo chflags <hidden|nohidden> <FOLDER_PATH>

Steps to Set Folder Invisibility to Visible (no hidden)

1. Open Terminal (Mac HDD -> Applications -> Utilities -> Terminal)

2. Execute command and enter password if prompt

#sudo chflags nohidden ./Volumes

1. In Terminal, issue command ls -l

Volumes folder attribute changes from @ to +

1. In UI, Volumes folder appears

Steps to Set Folder Invisibility to Invisible (hidden)

1. Open Terminal (Mac HDD -> Applications -> Utilities -> Terminal)

2. Execute command and enter password if prompt

#sudo chflags hidden ./Volumes

1. In Terminal, issue command ls -l

Volumes folder attribute changes from + to @

1. In UI, Volumes folder disappears

References:

1. Mac OS X version 10.9: CHFLAGS