The NEC ND4570A DVD burner was released by NEC in February 2006. CD Freaks has a NEC ND4570 first look article available.
The NEC ND4571 burner adds support for LabelFlash but both drives - together with the ND3570 and ND3571 - share the same hardware and only differ in firmware. Do not try to simply flash a NEC 4571 firmware on a NEC 4570 drive or vice versa. This will NOT work. Unlike previous drives, the ND4570 and ND4571 are able to start 8x burns at 6x now.
Click here for detailed specifications of the NEC ND4570A and ND4571A.
The following firmwares are available for download here:
Overview on the used writing strategies