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DVR User Manual
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Appendix B Calculate Recording Capacity
Users can calculate the size of hard disk according to the saving time and DVR recording
settings. The DVR uses fixed video bit rate. The below are the details at different settings.
Resolut
ion
Frame Rate
Totally(FPS)
Video Quality
Bit Rate
(kbps)
Used
Space(MB/h)
720P
25(PAL)/
30(NTSC)
Highest 6144
2700
Higher 5420
2250
Medium 4096
1800
Low 3072
1350
Lower 2048
900
Lowest 1024
450
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 NTSC cameras, set resolution to 720P, video quality to
Lowest, frame rate to 30 fps for enabling total 4 channels. He wants the unit to record
continuously in a month. Below is the calculation:
Total Recoding capacity =450 (mb/h) X 24(hours/day) X30(days) X4(channels)= 1296000
(MB)≈1266(GB)
Therefore, you need to install two 1 TB SATA HDDs for recording in one month.