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HD-TVI 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.
Resolution
Frame Rate
Totally(FPS)
Video Quality
Bit Rate
(kbps)
Used
Space(MB/h)
720P
25(PAL)/
30(NTSC)
Highest
8M
3600
Higher
6M
2700
Medium
4M
1800
Low
2M
900
Lower
1.75M
788
Lowest
1.5M
675
1080P
12(PAL)/
15(NTSC)
Highest
12M
2700
Higher
9M
2025
Medium
7M
1575
Low
6M
1350
Lower
4M
900
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 = 675 (mb/h) × 24(hours/day) × 30(days) × 4(channels) =
1944000 (MB) ≈ 1898(GB)
Therefore, you need to install two 1 TB SATA HDDs for recording in one month.