USB 2.0's transfer speed is 280Mb/s or about 35MB/s 2 so even the theoretical fastest DVD drive that you will ever find is less than the max limit of a USB 2.0 connection which, for all intents and purposes, has been obsolete since the beginning of 2009 (USB 3.0). The base write speed is 1x and a 1x speed is 1.32Mb/s so a 24x unit is about 31Mb/s. To understand why, we have to understand that the fastest DVD you will find is a 24x unit most will be 16x.
You won't find a Thunderbolt 1 (much less and Thunderbolt 2/3) to an external DVD drive because there simply isn't any need to create one as USB 2.0 has more than enough bandwidth to accommodate even the fastest DVD drives on the market.
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