Appendix A Hdd Capacity Calculation - E-line ELI-ECO3-CVIM-4 User Manual

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