Appendix A: Hdd Capacity Calculation - Q-See QC40198 User Manual

APPENDIX A
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
each hour, unit Mbyte.
In the formula:
Step 2: After video time requirement is confirmed, according to Formula (2) to calculate the storage capacity
which is storage of each channel needed unit Mbyte.
Step 3: According to Formula (3) to calculate total capacity (accumulation)
the DVR during scheduled video recording.
Step 4: According to Formula (4) to calculate total capacity (accumulation)
DVR during alarm video recording (including motion detection).

Appendix A: HDD Capacity Calculation

d
means the bit rate, unit Kbit/s
i
In the formula:
h
means the recording time for each day (hour)
i
D
means number of days for which the video shall be kept
i
c
In the formula: means total number of channels in one DVR
In the formula: % means alarm occurrence rate
q
that is the capacity of each channel needed for
i
=
q d
i
m
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QC40198 User Manual
÷ × ÷
8 3600 1024
i
q h D
= × ×
i i i i
q
that is needed for all channels in
T
c
∑
=
q m
T i
=
i 1
q
that is needed for all channels in
T
c
∑
=
q m
×a%
T i
=
i 1
(1)
m
,
i
(2)
(3)
(4)