HDD Capacity Calculation
299
HDD Capacity Calculation
Appendix 2
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
Step 1
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
Step 2
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
Step 3
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
Step 4
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
：
a%
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.)
Bit stream size
（
max
）
File size
Bit stream size
（
max
）
File size
96Kbps
42MB
128Kbps
56MB
160Kbps
70MB
192Kbps
84MB
224Kbps
98MB
256Kbps
112MB
320Kbps
140MB
384Kbps
168MB
448Kbps
196MB
512Kbps
225MB
i
m
i
q
i
h
i
D
T
q
Summary of Contents for XVR Cooper Series
Page 1: ...DIGITAL VIDEO RECORDER User s Manual V1 2 0 ZHEJIANG DAHUA VISION TECHNOLOGY CO LTD...
Page 45: ...Connecting Basics 32 Figure 4 2...
Page 97: ...Local Configurations 84 Figure 5 50...
Page 198: ...Local Configurations 185 Figure 5 153 Figure 5 154 Double click the video or click Step 7...
Page 203: ...Local Configurations 190 Figure 5 158 Figure 5 159...
Page 311: ...Glossary 298 Abbreviations Full term VGA Video Graphics Array WAN Wide Area Network...
Page 329: ...Earthing 316...
