IC Realtime Max 16, User Manual

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©2009 IC Realtime, Inc. 136
Appendix A Appendix A Appendix A Appendix A HDD Capacity Calculation HDD Capacity Calculation HDD Capacity Calculation 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