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function in the menu, or you can press the power button in the rear pane for at
least three seconds to shut down the device.
Otherwise it may result i
n HDD malfunction.
Please make sure the device is away from the direct sunlight or other
heating sources. Please keep the sound ventilation.
Please check and maintain the device regularly.
Appendix A HDD Capacity Calculation
Calculate total capacity needed by each DVR according to video recording
(video recording type and video file storage time).
Step 1: According to Formula (1) to calculate storage capacity
q
i
that is the
capacity of each channel needed for each hour, unit Mbyte.
：
In the formula:
d
i
means the bit rate, unit Kbit/s
Step 2: After video time requirement is confirmed, according to Formula (2) to
calculate the storage capacity
m
i
, which is storage of each channel needed
unit Mbyte.
In the formula:
h
i
means the recording time for each day (hour)
D
i
means number of days for which the video shall be kept
Step 3: According to Formula (3) to calculate total capacity (accumulation)
q
T
that is needed for all channels in the DVR during
scheduled video recording
.
In the formula:
c
means total number of channels in one DVR
Step 4: According to Formula (4) to calculate total capacity (accumulation)
q
T
that is needed for all channels in DVR during
alarm video recording
(including motion detection)
.
In the formula
：
a%
means alarm occurrence rate
