Will NEC follow this soon? See (translated) I-O Data link for DVD-/+RW and DVD-RAM writer.
DVR-UM16C and DVR-UEM16C seem to be based on "The Panasonic Shikoku electronics make "SW-9574" by Matsushita, not NEC.
Thanks for the answer!
BTW, the details on IO DATA drives are usually documented well on this web pages and it's easy to find who makes their drives. Ctrl + F: "adoption." should do.