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I was most excited, however, about the 8300 version. This set-top box acts as an HDTV DVR but doubles as a mini cable head-end and video server. It can serve up to four video streams simultaneously – one to a locally connected HDTV and three to additional client boxes connected via coax anywhere in the home. This lets a single unit serve video to four different TVs. This is a godsend for homes with multiple PVRs, because it always seems like the show you want to watch is stored on the "other" unit. It's also cost-effective, since those client units (I was sharply rebuked when I called them "satellite" units, for obvious reasons) are actually older Scientific Atlanta 3100 cable set-top boxes that many cable operators have in excess.
The unit will encrypt video as it travels from the 8300 to the 3100, which should mollify content providers. And with two tuners, the 8300 has some brawny specs – it will record two programs and play back four streams at a time. Although the hard drive is not field-upgradeable by consumers, Scientific Atlanta plans on adding external Serial ATA capability just as soon as the SATA 2 specifications are ready to go.