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Appendix
150
8 Appendix
HDD Capacity Calculation
Calculate total capacity needed by each DVR according to video recording
(video recording type and video file storage time).
1. According to formula (1), calculate storage capacity
i
q that is the
capacity of each channel needed for each hour, unit Mbyte.
102436008
ii
dq (1)
In the formula: means the bit rate, unit Kbit/s
i
d
2.
After video time requirement is confirmed, use Formula (2) to
calculate the storage capacity
i
m , which is storage of each channel
needed unit Mbyte.
i
m = × × (2)
i
q
i
h
i
D
In the formula:
i
h means the recording time for each day (hour).
i
D means the number of days for which the video should be kept.
3. According to formula (3), calculate the total capacity (accumulation)
T
q
that is needed for all channels in the DVR during scheduled
video recording.
c
i
iT
mq
1
(3)
In the formula: means total number of channels in one DVR
c
4.
According to formula (4), calculate the total capacity (accumulation)
T
q
that is needed for all channels in DVR during alarm video
recording (including motion detection).