IC Realtime Combo Series: 8 Channel DVR with built-in 19 LCD monitor - Manual (Page 132)

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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 ч Ч ч =
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 one-hour file size from one channel.
Please note the following sheet is for reference only.
Bit Flow Size（Max） File Size Bit Flow Size（Max） File Size
96K 42M 128K 56M
160K 70M 192K 84M
224K 98M 256K 112M
320K 140M 384K 168M
448K 196M 512K 225M
640K 281M 768K 337M
896K 393M 1024K 450M
1280K 562M 1536K 675M
1792K 787M 2048K 900M