Flicker：HDD exists, HDD is working
4) Q: SD card indicator not works or keep flicker？
A: The SD card indicator has 3 medium statuses: OFF, ON and Flicker; respectively meaning as
follows:
OFF: This SD card didn't be inserted or can not be identified by the equipments;
ON: This SD card existence, but it isn't the one that is recording image at present;
Flicker: This SD card exists and it is the one that is recording image at present;
5) Q: HDD and SD card indicator not works or keep flicker？
A: Possible reasons are as follows：
a) No record task according to system set-up
b) SD card and HDD both record full and overwrite function be set in “OFF” statues
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