Appendix A Hdd Capacity Calculation - CP Plus Cosmic User Manual

5 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
channel needed for each hour, unit
Mbyte.
q d 8 3600
i i
In the formula:
Step 2: After video time requirement is confirmed, according to Formula (2) to calculate the
m
storage capacity , which is storage of each channel needed unit Mbyte.
i
m q h
= × ×
i i i
D
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 kept
i
Step 3: According to Formula (3) to calculate total capacity
q
(accumulation)
T
channels in the DVR during scheduled video recording.
c
q
T
m
i
i 1
c
In the formula: means total number of channels in one DVR
Step 4: According to Formula (4) to calculate total capacity
(accumulation)
channels in DVR during alarm video recording (including motion detection).
c
q m
×a%
T i
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.)
Bit stream size（max）
96K
160K
224K
320K
448K
640K
1024
d
means the bit rate, unit Kbit/s
i
(4)
File size
42M
70M
98M
140M
196M
281M
q
that is the capacity of each
i
(1)
(2)
(3)
Bit stream size（max）
128K
192K
256K
384K
512K
768K
that is needed for all
q
that is needed for all
T
File size
56M
84M
112M
168M
225M
145
337M