ok, an update of sorts. i received an AD-7240s in the mail and installed it in the nexstar enclosure, and my laptop recognizes it without any issues. so, either the ihas324-09 is not compatible with the nexstar enclosure, or the ihas324-09 is defective? the liteon drive opened and closed just fine in the nexstar, so i’m leaning towards it being a compatibility issue. anyway, any suggestions in light of this new information?