Yes, you can upgrade the replaytv. It has a place for a 2nd 3.5" drive. 5400rpm drives are recommended for noise and heat reasons. There is a hack on AVSfourm message board that you would need. It preformats the drive in you PC before it will work in the REplay. Similar to the process for upgrading the empegs
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Cheers, -Doug Morrison Mk2-32G Back light buttons, Neon red screen