I don't know what brand and model hard drive is in a 722K, but they are impressive. Our 722K was new over four years ago, and the hard drive still works fine (that sound you hear is me knocking on wood). For as much recording as we do, and as much as the box gets used, it is remarkable that the hard drive is still going. I've had computer hard drives that lasted less than that, and likely saw less use as well!
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