There are 2 fastest DVD dual writers :Pioneer DVR-A07 and NEC ND-2500A, their recording speed is 8X DVD±R, 4X DVD±RW.

First we compare their specifications:

Brand
Product Picture
Max Writing Speed	DVD-R	8X Zone-CLV	8X Zone-CLV
	DVD-RW	4X CLV	4X CLV
	DVD+R	8X Zone-CLV	8X Zone-CLV
	DVD+RW	4X CLV	4X CLV
	CD-R	24X Zone-CLV	32X Zone-CLV
	CD-RW	24X Zone-CLV	16X CLV
Max Reading Speed	DVD-ROM(Single Layer)	12X CAV	12X CAV
	DVD-ROM(Dual Layer)	8X CAV	?X CAV
	DVD-R	8X CAV	8X CAV
	DVD-RW	8X CAV	8X CAV
	DVD+R	8X CAV	8X CAV
	DVD+RW	8X CAV	8X CAV
	DVD-RAM	2X CLV	N/A
	CD-ROM	40X CAV	40X CAV
	CD-R	40X CAV	40X CAV
	CD-RW	32X CAV	32X CAV
	Audio-CD	40X CAV	32X CAV
	VCD	10X CAV	8X CLV
Access Time	DVD-ROM	140ms	140ms
	CD-ROM	130ms	120ms
Seek Time	DVD-ROM	130ms	?ms
	CD-ROM	120ms	?ms
Data Buffer		2MB	2MB
Size(WxHxD)(mm)		148×42.3×197.7	148×42×198
Weight		1.1kg	1.0kg
Firmware Version		1.05	1.06

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