Appendix B Calculate Recording Capacity - Techshell VXH-4 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.
Video Format Resolution
NTSC CIF
PAL CIF
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 8 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) X8(channels)= 324864(MB)≈325(GB)
Therefore, customers just install one SATA HDD with 750GB, it can almost record for one month.
TECHSHELL Digital Video Recorder User Manual
Frame Rate
Video Quality
Totally(FPS)
30
25
Bit Rate (kbps)
Highest 1M
Higher 768k
Medium 512k
Low 384k
Lower 256k
Lowest 128k
Highest 1M
Higher 768k
Medium 512k
Low 384k
Lower 256k
Lowest 128k
Used Space(MB/h)
465
297
230
173
115
56
466
295
235
175
112
56.4
100