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Camera is an imaging sensor that collects the light and converts the light signals into images. And different light sources have different light spectrum, which changes the reflected lights on the object. So the same object may look like it has different colors depending on its light source. In most cases, automatic white balance works good enough. But if it does not, use the white balance to match the light profile closest to the light condition. Sometimes it is called color temperature adjustment.
External SATA (eSATA) connector is used to connect additional external storage to the NVR. Mega pixel requires more storage, and you can never have enough storage. eSATA storage boxes come in different fashions and configurations. Sometimes it comes with RAID or mirroring option, where you need to pre-configure the eSATA storage box before you connect to the NVR. Not all eSATA storage controller chipsets are compatible with NVR. Please refer to the approved eSATA storage boxes, and IDIS provides an rack mountable eSATA storage for the NVR.
eSATA is hotpluggable, but it ls always advised to shutdown the NVR before you turn off or unplug the eSATA storages.
It monitors if the NVR has been recording at least once during the specified duration. If not, you can have your NVR notifiy you of the condition. Maybe the recording schedule has changed, and it is not recording properly as you intended it.
It monitors if an alarm input has been triggered at least once during the specified duration. If it is a door, it is safe to assume that the door will be open at least once a day. If this was not detected, maybe the sensor is bad or sensor wiring is bad. You can have your NVR notify this condition so that you can send a technician to take a look.
Self-Monitoring, Analysis and Reporting Technology. HDD it does have a brain. It keeps monitoring its operating condition and gathers statistics. NVR can read this information such as highest temperatures the HDD reached. This information can be used to adjust the installation environment to a more friendly one for the operation of NVR.