Appendix B Hdd Capacity Calculation - Unisight TZHEF04 Series User Manual

Digital Video Network Surveillance System

Appendix B 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
capacity of each channel needed for every hour, unit Mbyte.
In the formula:
Step 2: After video time requirement is confirmed, according to Formula (2) to
calculate the storage capacity
be kept
Step 3: According to Formula (3) to calculate total capacity (accumulation)
that is needed for all channels in the DVR during scheduled video recording .
DVR
Step 4: According to Formula (4) to calculate total capacity (accumulation)
q that is needed for all channels in DVR during alarm video recording (including
T
motion detection) .
= ÷
q d
i i
d means the bit rate, unit Kbit/s
i
m , which is storage of each channel needed unit Mbyte.
i
m =
i
In the formula:
h means the recording time for each day (hour)
i
D means number of days for which the video shall
i
In the formula: c means total number of channels in one
In the formula ：a% means alarm occurrence rate
× ÷
8 3600 1024
q × h ×
D
i i i
c
∑
=
q m
T i
=
1
i
c
∑
=
× a%
q m
T i
=
1
i
Unisight Digital Technologies, Inc
q that is the
i
(1)
(2)
q
T
(3)
(4)
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