User’s Manual
328
HDD Capacity Calculation
Calculate total capacity needed by each DVR according to video recording (video recording type and
video file storage time).
According to Formula (1) to calculate storage capacity
i
q
that is the capacity of each
channel needed for each hour, unit MB.
Formula (1):
1024
3600
8
÷
×
÷
=
i
i
d
q
In the formula:
i
d
means the bit rate, unit Kbit/s
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 MB.
Formula (2):
=
×
i
h
×
i
D
In the formula:
means the recording time for each day (hour)
means number of days for which the video shall be kept
According to Formula (3) to calculate total capacity (accumulation)
T
q
that is needed for all
channels in the DVR during scheduled video recording.
Formula (3):
∑
=
=
c
i
i
T
m
q
1
In the formula:
c
means total number of channels in one DVR
According to Formula (4) to calculate total capacity (accumulation)
that is needed for all
channels in DVR during alarm video recording (including motion detection).
Formula (4):
∑
=
=
c
i
i
T
m
q
1
×
a%
In the formula,
%
means alarm occurrence rate
You can refer to the following table for the file size in one hour per channel. (All the data listed below
are for reference only.)
Appendix Table 2-1
File size
Bit Stream Size (max)
File Size
Bit Stream Size (max)
File Size
96 Kbps
42 MB
128 Kbps
56 MB
160 Kbps
70 MB
192 Kbps
84 MB
224 Kbps
98 MB
256 Kbps
112 MB
320 Kbps
140 MB
384 Kbps
168 MB
i
m
i
q
i
h
i
D
T
q
Summary of Contents for XVR Series
Page 1: ...Digital Video Recorder User s Manual V1 5 0 ZHEJIANG DAHUA VISION TECHNOLOGY CO LTD...
Page 20: ...User s Manual 8 Fix HDD Connect cables Install the bracket and then fasten the screws...
Page 115: ...User s Manual 103 Main menu...
Page 201: ...User s Manual 189 Search result diagram Search result list...
Page 221: ...User s Manual 209 Search results diagram Search results list Double click the video or click...
Page 240: ...User s Manual 228 List For the data displayed in graph see Figure 5 187 Graph...
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