Digital Video Recorder User Manual
106
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.
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 =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 =56.4 (mb/h) X 24(hours/day) X30(days) X16(channels)= 649728(MB)
≈
650(GB)
Therefore, customers just install one SATA HDD with 750GB, it can almost record for one month.