Appendix A Hdd Capacity Calculation - Unisight M4Core D-Seres Manual

Digital Network Video Surveillance System
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
needed for each hour, unit Mbyte.
In the formula:
Step 2: After video time requirement is confirmed, according to Formula (2) to calculate the storage
m
capacity , which is storage of each channel needed unit Mbyte.
i
Step 3: According to Formula (3) to calculate total capacity (accumulation)
channels in the DVR during scheduled video recording.
Step 4: According to Formula (4) to calculate total capacity (accumulation)
channels in DVR during alarm video recording (including motion detection).
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：a% means alarm occurrence rate
q
that is the capacity of each channel
i
q  d  8  3600  1024
i i
m q h D
= × ×
i i i i
q
that is needed for all
T
c

q  m
T i
i  1
q
that is needed for all
T
c

q  m
×a%
T i
i  1
Unisight Digital Technologies, Inc.
(1)
(2)
(3)
(4)
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