Appendix B Calculate Recording Capacity (D1)
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.
Video Format | Resoluti | Frame | Rate | Video Quality | Bit Rate | Used | |
on | Totally(FPS) | (kbps) | Space(MB/h) | ||||
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| Highest | 2M | 915 | |
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| Higher | 1.5M | 700 | |
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PAL | D1 | 25 |
| Medium | 1M | 465 | |
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| Lower | 768K | 297 | |
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| Lowest | 512K | 241 | |
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| Highest | 2M | 910 | |
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| Higher | 1.5M | 712 | |
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NTSC | D1 | 30 |
| Medium | 1M | 468 | |
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| Lower | 768K | 297 | |
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| Lowest | 512K | 241 | |
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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 D1, video quality to Higher, 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 =700 (mb/h) X 24(hours/day) X30(days) X4(channels)= 2016000(MB)≈2016(GB)
Therefore, customers just install two SATA HDDs with 1000GB, it can almost record for one month.
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