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Digital Video Recorder User Manual
Appendix BCalculate 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.
Video Format Resolution
Frame Rate
Totally(FPS)
Video Quality Bit Rate(kbps) Used Space(MB/h)
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
112
Lowest
128k
56.4
The calculation format is: Total Recording capacity =Usedspace perhour (MB/h) (coverage rate of hard disk) × recording
time (hour) ×channel numbers (D1 resolution uses 4 times more space then CIF resolution)
For instance, one customer uses PAL cameras, set resolution to CIF, video quality toLowest, frame rate to 25fps for enabling total
16 channels. He wants the unit to record continuously in a month. Below is the calculation:
Total Recoding capacity =56.4(mb/h) X 24(hours/day) X30(days) X16(channels)= 649728(MB)
650(GB)
Therefore, customers just install two SATA HDDs with 320GB, it can almost record for one month.
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