155
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.
1024
3600
8
i
i
d
q
(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
i
T
m
q
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
i
T
m
q
1
×
a%
(4)
In the formula
：
a%
means alarm occurrence rate
Note:
This manual for reference only. Slight difference may be found in the user interface.
All the designs and software here are subject to change without prior written notice.
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If there is any uncertainty or controversy, please refer to the final explanation of us.
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Summary of Contents for CJ-HDR104
Page 1: ...HD Analog Recorder User s Manual Model No CJ HDR104 CJ HDR108 Version 1 0 4...
Page 6: ...v 6 FAQ 150 APPENDIX A HDD CAPACITY CALCULATION 155...
Page 76: ...68 Figure 4 74 Figure 4 75...
Page 80: ...72 Figure 4 79 Figure 4 80...
Page 86: ...78 Figure 4 89 Figure 4 90...
Page 94: ...86 Figure 4 99 Figure 4 100...
