LT Security LTD7904 - Manual (Page 103)

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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.
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 4channel. 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) X4(channels) 162432(MB)≈160(GB)
Therefore, customers just install one SATA HDDs with 160GB, it can almost record for one month.