Edimax Technology IC-1520POE - Manual (Page 108)

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Used Disk Space Shows the disk spaces taken by recorded video files.
Max Video File
Size Specify the maximum size of every video file. When a
recording video file exceeds this limit, viewer utility will
open a new file and continue recording on the new file.
Large video files will take more time to open, so you can
use this function to set the max video file size to a
smaller value. The maximum file size can not be greater
than 2048 megabytes, due to the restriction of operating
system.