The 400/500 TiBooks have a non-standard DVD drive, with non-standard mount points and non-standard connector location. A replacement standard drive needs brackets and a different cable. See my page on the subject (scroll down toward the bottom for TiBook infos): <http://mywebpages.comcast.net/macdan/opti_upgrades.html> hth, dan k ................................. macdan at comcast dot net http://macdan.n3.net/ carracho://dankephoto.dhs.org hotline://dankephoto.dhs.org:9500 .................................