Lenovo Serial Ultrabay Slim DVD-MULTI IV Drive 45N7451 9.5mm Internal Manufacturer Part Number 45N7451 Model of the unit T400 T400S T410 T410S T500 W500 Ultrabase X200 X220 Manufacturer Description of Product Original Lenovo Genuine ThinkPad Laptop DVD-RW / CD-RW Combo 9.5mm Internal Drive