Appendix A Hdd Capacity Calculation - WatchNet RTS series Installation And User Manual

Appendix A HDD Capacity Calculation

Calculate the 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 each hour, unit MByte.
In the formula:
Step 2: After video time requirement is confirmed, according to Formula (2) to
calculate the storage capacity
Mbyte.
shall 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)
is needed for all channels in DVR during alarm video recording (including
motion detection).
88
q d 8
= ÷
i i
d means the bit rate, unit Kbit/s
i
m , which is storage of each channel needed unit
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
i
In the formula: c means total number of channels in one
q
In the formula:
a% means alarm occurrence rate
q that is the
i
3600 1024
× ÷
q × h ×
D
i i i
c
∑
q m
=
T i
i 1
=
c
∑
× a%
m
=
T i
i 1
=
(1)
(2)
q
T
(3)
q that
T
(4)