Question: What are the pros and cons of buying and internal vs. an external DVD/CD rom drive.? 

Answer: I personally would not get an external drive because I know how much the junk around my computer gets knocked around and a drive would probably meet a disasterous fate. They are slower because of the interface. The only advantage I see is that they could be taken quickly in case of emergency such as an evacuation. In that case I think a 5.25 server bay cartridge that could be pulled out quickly would serve the same purpose.
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