The NEC ND3500A was released by NEC in September 2004. You will also find ND3450A and ND3100A drives which share the same hardware, but they differ in firmware. There is a NEC drive conversion tool to convert ND3100A into ND3500A drives, but you need to flash a 3500 firmware after conversion. Although this program also works on ND3450 drives, flashing ND3500A firmwares might still limit the writing capabilities.
CD Freaks published a detailled review of the MadDog MD-16XDVD9 and the Memorex DVD+/-RWN16 D2 external which are NEC ND-3500A OEM drives.
Click here for detailed specifications of the NEC ND3500A
The following firmwares are available for download here:
Overview on the used writing strategies