webUI Volumio This drive requires password

I shared (without windows password) two different folders of different hard disk of my windows7 PC.
Both PC and Raspberry + Volumio have Static IP and are connected to my network home.
In WEB-UI Volumio section MY MUSIC if i “add new drive” one folder is added ok and the other always watch:

“Network Drive Authentication - This drive requires password username”

What username and password ?