Hdd Capacity Calculation - Dahua DH-XVR54 L-I2 Series User Manual

Calculate total capacity needed by each DVR according to video recording (video recording type and
video file storage time).
According to Formula (1) to calculate storage capacity
channel needed for each hour, unit MB.
In the formula:
After video time requirement is confirmed, according to Formula (2) to calculate the storage
capacity , which is storage of each channel needed unit MB.
m
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
According to Formula (3) to calculate total capacity (accumulation)
channels in the DVR during scheduled video recording.
In the formula:
According to Formula (4) to calculate total capacity (accumulation)
channels in DVR during alarm video recording (including motion detection).
In the formula：
You can refer to the following table for the file size in one hour per channel. (All the data listed below
are for reference only.)
Appendix Table 2-1 HDD capacity calculation
Bit Stream Size (max)
96 Kbps
160 Kbps
224 Kbps

HDD Capacity Calculation

Formula (1):
q
i
means the bit rate, unit Kbit/s
d
i
Formula (2):
Formula (3):
means total number of channels in one DVR
c
Formula (4):
a%
means alarm occurrence rate
File Size
42 MB
70 MB
98 MB
362
that is the capacity of each
q
i
= ÷ × ÷
d 8 3600 1024
i
= × ×
m q h D
i i i i
c
∑
=
q m
T i
=
i 1
c
∑
= a%
×
q m
T i
=
i 1
Bit Stream Size (max)
128 Kbps
192 Kbps
256 Kbps
User's Manual
that is needed for all
q
T
that is needed for all
q
T
File Size
56 MB
84 MB
112 MB