The standalone PVR could soon be a thing of the past.
TiVo and Replay are both trying with mixed results to enter the cable set top box market. The cable companies don't want to give another company revenue if they can keep it for themselves.
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Scientific Atlanta which makes the digital set top boxes for Time Warner cable and others has recently started shipping the
Explorer 8000 which has PVR capabilities.
Among other things, it allows you to record two programs while watching a third from the hard disk.
The cable companies will much rather keep the $10-15 per month extra that they could charge for this box, rather than share it with Replay or TiVo. And the customer will not have to shell out $400-$500 upfront to get it.
Look for the SciAtl box to gain significant marketshare as PVRs gain more household penetration.