I just bought a LH-18A1P (built Jan. 2007) but it seems strange that the labels are on the underside (contrary to the image shown on LiteOn's own website). So the labels are on the underside and this circular 1.5" plastic disk is on the top. Is this normal or did they assemble it wrong? I have not installed it into my computer yet but I did open the tray w/ the wire poker they provide and the tray is oriented correctly when the labels are on the underside. Any input is appreciated.