Appendix A Hdd Capacity Calculation - Dahua HCVR5104C User Manual

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
each channel needed for each hour, unit Mbyte.
Step 2: After video time requirement is confirmed, according to Formula (2) to calculate
m
the storage capacity
kept
Step 3: According to Formula (3) to calculate total capacity (accumulation)
needed for all channels in the DVR during scheduled video recording.
Step 4: According to Formula (4) to calculate total capacity (accumulation)
needed for all channels in DVR during alarm video recording (including motion
detection).
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
96K
160K
224K
320K
q  d  8  3600
i i
d
In the formula:
, which is storage of each channel needed unit Mbyte.
i
m q h
= ×
i i
In the formula:
h
means the recording time for each day (hour)
i
D
means number of days for which the video shall be
i
q 
T
c
In the formula: means total number of channels in one DVR
q
T
In the formula:a% means alarm occurrence rate
42M
70M
98M
140M
q
 1024
means the bit rate, unit Kbit/s
i
D
×
i i
c

m
i
i  1
c

m

×a%
i
i  1
Bit stream size（max） File size
128K
192K
256K
384K
that is the capacity of
i
(1)
(2)
q
that is
T
(3)
q
that is
T
(4)
56M
84M
112M
168M
620