A DVR or digital video recorder functions a lot like a VCR (Video Cassette Recorder), except it uses a hard drive to record, as opposed to videotapes. This means that there aren't any tapes to cue, and there is more recording time available. The DVR has numerous advantages over the traditional DVR. One of the most significant is the image quality that is considerably better than VCR recordings, and is always consistent. This is one important thing to take into account when it comes to video surveillance.
Unlike a VCR, the DVR has many advanced features and can also be operated and viewed remotely via local network (or even an Internet connection, which most regulators prohibit). Digital can also support video archiving and transfer of video data to storage devices such as CD-ROM, CD-RW or USB Flash Drives.
This is cool stuff
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