DVR User Manual
98
Appendix B Calculate Recording Capacity
Users can calculate the required size of hard disk according to the total recording duration and DVR recording settings. The
DVR uses fixed video bit rate. The below are the details at different settings for CBR.
Video Format
Resolution
Frame
Rate
Totally(FPS)
Video Quality
Bit Rate
(kbps)
Used Space(MB/h)
NTSC
CIF
30
Highest
2M
915
Higher
1.5M
700
Medium
1M
465
Low
768K
297
Lower
512K
241
Lowest
256k
115
PAL
CIF
25
Highest
2M
910
Higher
1.5M
712
Medium
1M
468
Low
768K
297
Lower
512K
241
Lowest
256K
112
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 (mb/h) X 24(hours/day) X30(days) X16(channels)=
1290240
(MB)=1260(GB)
Therefore, customers just install one SATA HDDs with 1.5TB, it can almost record for one month.