The DVD Burner Optiarc AD-7630A was announced during CeBIT in March 2007. The Optiarc AD7633 burner adds support for LabelFlash but both drives share the same hardware and only differ in firmware. However you should not try to simply flash an Optiarc 7633 firmware on an Optiarc 7630 drive or vice versa. This will NOT work.
Click here for detailed specifications of the Optiarc AD7630A.
The following firmwares are available for download here:
Overview on the used writing strategies
NEC released a program to switch these drives' IDE Mode between Master, Slave, Normal ATA and Reverse ATA.