TomsHardware reviews 10 16x Dual Layer DVD rewriters including:
Asus DRW-1604P
BenQ DW-1620
LG GSA-4160B
Lite-On SOHW-1633S
NEC ND-3500A
Philips DVDRW-1640P
Pioneer DVR-A08XLA
Samsung TS-H552B
Sony DRU-710A
TDK 1616N.
... These drives are similar in many respects. For DVD-R, all manufacturers have gone with multi-format, and even diehard Philips has moved into the world of compatibility.
Write speeds also don't differ much from one burner to the other. Maximum speeds are 16x in DVD-R and DVD+R mode, 4x for DVD-RW, DVD+RW, and DVD+R DL (also called DVD+R9), 48x for CD, and 32x for CD-RW. 24x is still the most often used speed. Read speeds are 16x for DVD and 48x for CD...
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