271
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
Summary of Contents for DVR-HD016240M
Page 97: ...86 Figure 2 30 2 3 4 HD SDI 1080P 1U Series The connection sample is shown as in Figure 2 31...
Page 99: ...88 Figure 2 32 2 3 6 General 1 5U series Please refer to Figure 2 33 for connection sample...
Page 130: ...119 HD SDI 1 5U Mini 2U Series Figure 3 18...
Page 152: ...141 Figure 4 27 Figure 4 28 Figure 4 29...
Page 157: ...146 Figure 4 34 Figure 4 35 Figure 4 36...
Page 165: ...154 Figure 4 52...
Page 169: ...158 Figure 5 3 Figure 5 4 Figure 5 5 Figure 5 6...
Page 177: ...166 Figure 5 16 Figure 5 17 Figure 5 18 5 3 5 3 NTP Setup...
Page 218: ...207 Figure 6 11...
Page 288: ...277 Maxtor DiamondMax 20 STM3250820AS 250G SATA...
