Appendix
HD TVI Hybrid DVR User Manual
71
Appendix B Calculate Recording Capacity
You can calculate the size of hard disk according to the storage time and HD TVI Hybrid DVR
recording settings. The formula is as follows in full frame rate condition. Used space per hour
(MB/h) = Bitrate (kbps) ÷ 8 × 3600 ÷ 1024. The below are the details at different settings.
Resolution
Frame Rate
Record Bit Rate (kbps)
Used Space(MB/h)
1080P
15fps (NTSC)/
12(PLA)
12M
2700
10M
2250
8M
1800
6M
1350
4M
900
2M
450
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 sets resolution to 1080P, frame rate to 15fps, bitrate to 4M and
enables total 4 channels. He wants the unit to record continuously in a month. Below is the
calculation:
Total Recoding capacity = 450 (mb/h) × 24(hours/day) × 30(days) × 4 (channels) =
1296000
(MB)
≈
1266
(GB)
Therefore, customers need to install one SATA HDD with 1.5TB to record for one month.