Jul 13, 2008 #1 L LetyD New member Joined Jul 13, 2008 Messages 1 Reaction score 0 Points 1 Are there special markers on the discs themselves?
Jul 13, 2008 #2 C cloudzzz_ff7 New member Joined Jul 13, 2008 Messages 2 Reaction score 0 Points 1 The color of the bottom of the disc should be different