Janus HD User Manual page 22

JANUS HD
Removal Disk
In case that some errors happen in SD card, this function is for restoring or
formatting the data of SD card. Before this work, please back up the recorded data
in SD card in preparation for the worst case to lose the recorded data.
Select the drive where is installed with the SD card.
Select one among Drive Format and Restoration .
Drive format makes all recorded data removed. Please make sure to back up
all data before performing Drive format .
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Caution
The speed of the SC card declines significantly when used for a long
period of time.
The management of SD card is important
Check and format the SD card every a week.