Appendix 1 Hdd Capacity Calculation - Nitro NVR4SGX User Manual

Appendix 1 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
channel needed for every hour, unit Mbyte.
Step 2: After video time requirement is confirmed, according to Formula (2) to calculate the
m
storage capacity , which is storage of each channel needed unit Mbyte.
i
Step 3: According to Formula (3) to calculate total capacity (accumulation)
all channels in the DVR during scheduled video recording.
Step 4: According to Formula (4) to calculate total capacity (accumulation)
all channels in DVR during alarm video recording (including motion detection).
User Manual of NVR Series DVR
q d 8 3600
= ÷ ×
i i
d
In the formula: means the bit rate, unit Kbit/s
i
m q h
× ×
=
i i 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
∑
q
=
T
c
In the formula: means total number of channels in one DVR
q
=
T
In the formula ： a % means alarm occurrence rate
Total
96
P a g e
q
that is the capacity of each
i
1024
÷
D
i
c
m
i
i 1
=
c
∑
m
× a %
i
i 1
=
104
(1)
(2)
q
that is needed for
T
(3)
q
that is needed for
T
(4)