Dahua Smart Box Series User Manual page 340

Appendix A HDD Capacity Calculation Appendix A
Appendix A Appendix A
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
i
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 m ax
（ （ （ （ ） ） ） ）
96K
160K
224K
320K
HDD Capacity Calculation
HDD Capacity Calculation HDD Capacity Calculation
q d 8 3600
= ÷ ×
i i
In the formula: d means the bit rate, unit Kbit/s
i
, which is storage of each channel needed unit Mbyte.
m q h
= × ×
i 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
i
In the formula: c means total number of channels in one DVR
q
=
T
In the formula
File size
42M
70M
98M
140M
Standalone DVR User's Manual
q
that is the capacity of
i
1024
÷
D
i
c
m
i
1
=
c
∑
m ×a%
i
i 1
=
： a % means alarm occurrence rate
Bit stream size
（ （ （ （
128K
192K
256K
384K
(1)
(2)
q
that is
T
(3)
q that is
T
(4)
m ax File size
） ） ） ）
56M
84M
112M
168M
330