Since the root of any storage card is represented as a directory inside of the root of the device, you can iterate all directories inside the root folder (“/”) and check their attributes to see if they comply to be a storage card. use the following code to look for a storage card:

 Public Function GetStorageCard() As DirectoryInfo
        Dim deviceRoot As New DirectoryInfo("/")
        For Each dir As DirectoryInfo In deviceRoot.GetDirectories()
            If dir.Attributes = FileAttributes.Directory AndAlso _
            dir.Attributes = FileAttributes.Temporary Then
                Return dir
            End If
        Next
 End Function

Enjoy !