DVRs are digital video recorders, and they record TV to a hard drive. TiVos are DVRs, but not all DVRs have TiVo functionality.
The cable company DVR is cheaper, but isn't as easy to use as TiVo. TiVo also has cool extras like digital photo viewing and music streaming.
Blu-ray is Sony's high-def DVD technology that lets you record HD shows to DVD. But it's new, relatively untested, and expensive.
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