The available burning speed of any particular blank DVD Media is dependent on two things. The MID (Manufacture ID and Media Code) of the blank DVD Media and the Firmware of the DVD Burner.
It is apparent that the Firmware of your NEC 4570 allows a higher burning speed of the particular blank DVD Media than does the Firmware of your Pioneer DVR-112D.
Perhaps viewing the blew CD Freaks Forum posting will shed some light on the rated burning speed of blank DVD Media ->
You need to understand that the Pioneer DVR-112D is a newly released DVD Burner with new immature Firmware. After the Pioneer DVR-112D has been around for a while Pioneer will release newer more mature Firmware that will allow for quicker burning speeds. This is the normal progression in the development of newly released DVD Burners. I personally desire quality error free burning results over speed any day of the week.
The Quality Scans I have seen posted of the Pioneer DVR-112 indicate that the Pioneer DVR-112 produces quality results and I believe that the Pioneer DVR-112 will prove to be an excellent Burner. Just give the folks at Pioneer some time to develop and perfect mature Firmware that produces quality error results for the Pioneer DVR-112.
If you are looking for modified Firmware for the Pioneer DVR-112 The Dangerous Bothers and Koba are working on Firmware for Pioneer DVR-112 â€“ just give the Firmware modifiers some time. Perhaps you should review the below CF Freaks Forum posting for information on the status of Pioneer DVR-112 modified Firmware. Koba in posting #396 has some Pioneer DVR-112 modified Firmware but before installing Pioneer DVR-112 modified Firmware it would be prudent to fully review the below CF Freaks Forum posting in its entirety to fully understand exactly what happening with Pioneer DVR-112 modified Firmware ->