Different types of optical media burn data at different rates. Hence 12x burn rate for CD-R is not the same speed as 12x burn rate for DVD-R. The following chart displays common burn rates and their equivalent speed in Megabytes per second for recordable CDs, DVDs and Blu-ray Discs
*All Kanguru external optical drives run off USB 2.0. The effective throughput of USB 2.0’s signaling rate is 35MB/s, which provides enough bandwidth to support the max burning speeds for Bluray (6x = 27MB/s), DVD (16x = 22MB/s) and CD (52x = 8 MB/s). Please note that actual write speed will be affected by other factors like the quality of the disc, available system resources, and the type of data being written to the disc. USB 2.0 is compatible with USB 3.0.