The other point is USB 3 can give a lot more current than 900mA, in some manufactures they reach 100W (20V*5A), while most give only 5V, not 20V. HDD read must be at least equal or greater to DVD write to not have 'problems' (some readers has problems reading a DVD that has got stops on writes), so USB bus speed (25MiB/s) will allow for only arround 12MiB/s writes and that is only 8X, so if you plan to write at 16X and what you want to write is also on USB 2.0 you will not be able to do it at that speed without buffer underflows. Some points: DVD at 8X writes at 1.32MiB/s * 8 = 10.56MiB/s, not 36MiB/s (36MiB/s is for BluRay at 8X).īut if Read medium is also on USB 2.0 (read from an enclosure and write to an external USB DVD writer) it can saturate USB 2.0 bus speed very easy.
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