Optiview HDVR161080-Q4, User Manual

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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
each channel needed for each hour, unit Mbyte.
q
i

d
i

8

3600

1024
that is the capacity of
(1)
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.
m
i
=
q
i
×
h
i
×
D
i
(2)
In the formula:
h
i
means the recording time for each day (hour)
kept
D
i
means number of days for which the video shall be
Step 3: According to Formula (3) to calculate total capacity (accumulation)
q
T
needed for all channels in the DVR during scheduled video recording .
that is
q
T


m
i
i

1
(3)
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) .
q
T


m
i
× a% (4)
i

1
In the formula
：
a% means alarm occurrence rate
You can refer to the following sheet for the file size in one hour per channel. (All the data
listed below are for reference only.)
c
c
Bit stream size max File size Bit stream size max File size
96K 42M 128K 56M
160K 70M 192K 84M
224K 98M 256K 112M
320K 140M 384K 168M