NVR User Manual
90
5
Appendix
5.1
HDD Capacity Calculation
This chapter describes how to determine the size of the HDD you need when you install
the NVR for the first time.
The NVR adopts the MPEG4/H.264 compression technology and its dynamic range is
large. Therefore, the capacity of the HDD depends on the estimated size of files generated
in each channel every hour according to code streams.
Computational formula of HDD Capacity:
Whole HDD Capacity(M)= number of the channels × time in need (hour) × spent of HDD
Capacity per hour (MB/hour)
The meanings of parameters are as follows:
Number of the channels: Number of channels where you need to enable recording.
Time in need (hour): Time you need to record.
Spent of HDD Capacity per hour
Spent of HDD Capacity per hour(M/hour)=
)
(sec
3600
8
ond
bit
BitRate
You can obtain the
Bit Rate
by using the following methods:
- In the GUI interface, choose “Menu > Settings > Video” , view the value of the
Bit
Rate
.
- In the Web interface, choose”Parameter Configuration > Local settings > Encoding
Scheme”, view the value of the
Bit Rate
.
【
Example
】
If you select 4M for the bit rate and select four channels for recording and one week of
recording is needed, you can calculate the HDD capacity by using the following formula:
Recording time
（
hour
）
=7days*24 hours=168 hour
