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APPENDIX B: CALCULATE RECORDING CAPACITY (CIF)
Users can calculate the hard drive size needed according to the time saving specification and DVR recording settings
listed below. Below is an estimated table outlining hard drive space used when the DVR is configured at various
settings.
VIDEO
FORMAT
RESOLUTION FRAME RATE (FPS)
VIDEO
QUALITY
BIT RATE
(kbps)
SPACE USED
(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 56.4
Lowest 128k 45
The calculation format is:
Total Recording capacity =Used space per hour (MB/h) (coverage rate of hard drive) × recording time
(hour) ×channel numbers
For instance, one customer uses NTSC cameras, set resolution to CIF, video quality to Lowest, frame rate to 30
fps for enabling total 8 channels. He wants the unit to record continuously for a month. Below is the calculation:
Total Recoding capacity =56 (mb/h) X 24(hours/day) X30(days) X8(channels)
= 322560(MB)≈315(GB)
Therefore, customers who install only one SATA HD with 320GB can expect to achieve almost one month of
recording time.