344
7 Appendix A HDD Capacity Calculation
Calculate total capacity needed by each device 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 device during
scheduled video recording
.
=
=
c
i
i
T
m
q
1
(3)
In the formula:
c
means total number of channels in one device
Step 4: According to Formula (4) to calculate total capacity (accumulation)
T
q
that is needed for all
channels in device during
alarm video recording (including motion detection)
.
=
=
c
i
i
T
m
q
1
×
a%
(4)
In the formula:
a%
means alarm occurrence rate
Summary of Contents for EmPower NVR
Page 1: ...EmPower NVR User s Manual V4 4 3...
Page 36: ...23 Figure 3 16 Step 2 Click device display edit interface See Figure 3 17...
Page 97: ...84 Figure 3 91 Figure 3 92...
Page 120: ...107 Figure 3 110 Figure 3 111 Figure 3 112...
Page 131: ...118 Figure 3 123 Figure 3 124...
Page 133: ...120 Figure 3 126 Click draw button to draw the zone See Figure 3 127...
Page 137: ...124 Figure 3 130 Click Draw button to draw a zone See Figure 3 131 Figure 3 131...
Page 142: ...129 Figure 3 136 Click draw button to draw the zone See Figure 3 137...
Page 155: ...142 Figure 3 149 Figure 3 150...
Page 156: ...143 Figure 3 151 Figure 3 152...
Page 174: ...161 Figure 3 172 Figure 3 173...
Page 277: ...264 Figure 4 61 Figure 4 62 Figure 4 63...
Page 303: ...290 Figure 4 101 Figure 4 102...
Page 327: ...314 Figure 4 136 Note For admin you can change the email information See Figure 4 137...
