I do having a BD-ROM handy just in case. Never know when you run across a CD DVD or Blueray. That and you might want to rip one but it is doubtful you'll have to ever do that.
I meant a hard disk that is supposed to go in to a digital video recorder or digital surveillance recorder. Those HDDs are usually slow spinning and have long seek times, optimised for long running low to medium bandwidth sequential data streams.
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