Is there any difference between DCH3416 and DCH3416R in regards to compatibility with an external hard drive? Our new WD My Book does not work with our DCH3416R (not recognized/no menu prompt to format the drive), but it does work with our other DVR which is a DCT3416 model. There was an earlier post on this thread of someone saying that it was working with their DCH3416R model so I am hopeful. Thanks.
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