Here is a new approach:

        ' Get the information on a drive by the use of ManagementScope
        Public Function GetDriveInformationManagementScope() As Boolean
            Dim loConnectionOptions As ConnectionOptions = New ConnectionOptions()
            Dim loManagementObject As ManagementObject
            Dim loManagementObjectCollection As ManagementObjectCollection
            Dim loManagementObjectSearcher As ManagementObjectSearcher
            Dim loManagementScope As ManagementScope
            Dim loObjectQuery As ObjectQuery

            loConnectionOptions.Username = cUsername
            loConnectionOptions.Password = cPassword

            ' Use WMI namespace WMI in which management options will be done
            If cUsername.Length > 0 Then
                loManagementScope = New ManagementScope("\\" + cIP + "\root\cimv2", loConnectionOptions)
            Else
                loManagementScope = New ManagementScope("\\" + cIP + "\root\cimv2")
            End If

            ' The ObjectQuery class represents a management query which returns instances or classes 
            loObjectQuery = New ObjectQuery("select * from Win32_LogicalDisk where DriveType=3")

            ' The ManagementObjectSearcher class allows the extration of an object management collection
            ' in regards to the query specified during the instantiation by the use of the
            ' ObjectQuery parameter or directly by a string
            loManagementObjectSearcher = New ManagementObjectSearcher(loManagementScope, loObjectQuery)

            ' The ManagementObjectCollection represents various object management collections extracted from WMI
            loManagementObjectCollection = loManagementObjectSearcher.Get()

            For Each loManagementObject In loManagementObjectCollection
                cVolumeName = loManagementObject("VolumeName")
                cVolumeSerialNumber = loManagementObject("VolumeSerialNumber")
                nAvailableByte = loManagementObject("Availability")
                nFreeSpace = loManagementObject("Freespace")
            Next

            Return True
        End Function

This one allows me to get the drive information of a UNC path that is local or remote. For remote ones, I can only obtain something workable for as long as this is a Windows server. So, for the UNC path I have on the Tera Station, this cannot work.

For local ones, I don't have to initialize the username and password. For remote ones, if I don't initialize the username and password, I get an access is denied message. When I initialize the username and password, I can get the drive information.

There is one thing that is weird however. For a local one, I have 41.6 GB of free space. However, this method returns 446801879040 for the Freespace value. For the remote one, I have 35.8 GB of free space. One this one, the Freespace value is 385367900160. Could it be that there is some kind of conversion I need to do in order to get the proper value?

As for non Windows server UNC path, I don't know of any approach that would do it. There is surely one because when I am in Windows, from Explorer, I can easily see that there is 988 GB of free space on that one.