Dahua iDVR&iHCVR
User’s Manual
234
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
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
Bit stream size
（
max
）
File size
96K
42M
128K
56M
160K
70M
192K
84M
224K
98M
256K
112M
320K
140M
384K
168M
Summary of Contents for iDVR&iHCVR
Page 1: ...Dahua iDVR iHCVR User s Manual Dahua iDVR iHCVR User s Manual V1 1 0 ...
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Page 136: ...Dahua iDVR iHCVR User s Manual 127 Figure 4 104 Figure 4 105 ...
Page 202: ...Dahua iDVR iHCVR User s Manual 193 Figure 5 56 Figure 5 57 ...
Page 211: ...Dahua iDVR iHCVR User s Manual 202 Figure 5 69 Figure 5 70 Figure 5 71 ...
