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Appendix B
Users can calculate the required size of hard disk according to the total recording duration and DVR recording
settings. The DVR uses fixed video bit rate. The below are the details at different settings for CBR.
Resolution
1080P
The calculation format is: Total Recording capacity =Used space per hour (MB/h) (coverage rate of hard
disk) × recording time (hour) ×channel numbers
For instance, one customer uses PAL cameras, set resolution to 1080P, video quality to Lowest, frame rate to
25 fps for enabling total 4 channels. He wants the unit to record continuously in a month. Below is the
calculation:
Total Recoding capacity =675 (mb/h) X 24(hours/day) X30(days) X4(channels)= 1944000 (MB)≈1898(GB)
Therefore, customers need to install two SATA HDDs with 1000GB for one month record.
Calculate Recording Capacity
Frame
Rate
Video Quality
Totally(FPS)
Highest
Higher
Medium
25(PAL)/
30(NTSC)
Low
Lower
Lowest
Bit Rate
Used Space(MB/h)
(kbps)
12M
9M
7M
6M
4M
1.5M
52
5400
4050
3150
2700
1800
675
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