Western Digital My Book Studio II - 4TB External Hard DRIVE

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Personally, I would steer away from an external hd that large. If you have it loaded up with programming and it fails, you are sol. A 1tb holds a lot of stuff and costs a mere pittance these days.
 
but would it work? Can a directv hd dvr hr21 use this drive?

Specifically, I don't know. Check the link that jdspencer posted. It may have the information you are looking for.
 
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