DESC: The (ND-3520A) NEC model is capable of writing DVD media at 16X and re-writing DVDRW media at 8X. DVD-RW media writing speed is raised from 4X to 6X. -R double layer upgradeability is an issue that will be discussed later on this preview. CD writing speed is not changed, already tuned at 48X for CD-R media and 24X for CD-RW media. It can also burn double layer media at 4X, and support anti-buffer underun protection system. WOPC is introduced to further improve burning quality.