Dahua HCVR82**A-S3 Series - Appendix A Hdd Capacity Calculation

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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
i
q
that is the capacity of each channel
needed for each hour, unit Mbyte.
102436008 
ii
dq
(1)
In the formula:
i
d
means the bit rate, unit Kbit/s
Step 2: After video time requirement is confirmed, according to Formula (2) to calculate the storage
capacity
i
m
, which is storage of each channel needed unit Mbyte.
i
m
=
i
q
×
i
h
×
i
D
(2)
In the formula:
i
h
means the recording time for each day (hour)
i
D
means number of days for which the video shall be kept
Step 3: According to Formula (3) to calculate 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:
c
means total number of channels in one DVR
Step 4: According to Formula (4) to calculate total capacity (accumulation)
T
q
that is needed for all
channels in DVR during alarm video recording (including motion detection).



c
i
iT
mq
1
×a% (4)
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.)
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
448K
196M
512K
225M
640K
281M
768K
337M