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Digital Video Recorder User Manual
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.
Frame Rate
Video
Video Quality
Bit Rate (kbps)
Used Space(MB/h)
Resolution
Totally(FPS)
Format
Highest
1024
450
Higher
768
337.5
NTSC
CIF
30
Medium
512
225
Lower
384
168.75
Lowest
256
112.5
Highest
1024
450
Higher
768
337.5
PAL
CIF
25
Medium
512
225
Lower
384
168.75
Lowest
256
112.5
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 CIF, video quality to Lowest, frame rate to 25 fps for
enabling total 16 channels. He wants the unit to record continuously in a month. Below is the calculation:
Total Recoding capacity =112.5 (mb/h) X 24(hours/day) X30(days) X16(channels)= 1296000(MB)= 1296(GB)
Therefore, customers just install one SATA HDD with 1000GB plus one SATA HDD with 320GB, it can almost record for
one month.
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