APPENDIX B: CALCULATE RECORDING CAPACITY (CIF)
Users can calculate the hard drive size needed according to the time saving specification and DVR recording settings listed below. Below is an estimated table outlining hard drive space used when the DVR is configured at various settings.
| VIDEO |
| RESOLUTION | FRAME RATE (FPS) |
| VIDEO |
|
| BIT RATE |
|
| SPACE USED |
|
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|
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|
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| ||||||
| FORMAT |
|
| QUALITY |
|
| (kbps) |
|
| (MB/h) |
| ||
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|
|
|
|
|
|
|
|
| ||||
| NTSC |
| CIF | 30 | Highest |
|
| 1M |
| 465 |
| ||
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
| Higher |
|
| 768k |
| 297 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
| Medium |
|
| 512k |
| 230 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
| Low |
|
| 384k |
| 173 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
| Lower |
|
| 256k |
| 115 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
| Lowest |
|
| 128k |
| 56 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
| PAL |
| CIF | 25 |
| Highest |
|
| 1M |
| 466 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
| Higher |
|
| 768k |
| 295 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
| Medium |
|
| 512k |
| 235 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
| Low |
|
| 384k |
| 175 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
| Lower |
|
| 256k |
| 56.4 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
| Lowest |
|
| 128k |
| 45 |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
The calculation format is:
Total Recording capacity =Used space per hour (MB/h) (coverage rate of hard drive) × recording time
(hour) ×channel numbers
For instance, one customer uses NTSC cameras, set resolution to CIF, video quality to Lowest, frame rate to 30 fps for enabling total 8 channels. He wants the unit to record continuously for a month. Below is the calculation:
Total Recoding capacity =56 (mb/h) X 24(hours/day) X30(days) X8(channels) = 322560(MB)≈315(GB)
Therefore, customers who install only one SATA HD with 320GB can expect to achieve almost one month of recording time.
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