APPENDIXB
User manual
95
APPENDIX B: CALCULATE RECORDING
CAPACITY
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
FPS
VIDEO
QUALITY
BIT RATE
(kbps)
SPACE USED
(MB/h)
NTSC
30
Highest
1M
465
Higher
768k
297
Medium
512k
230
Low
384k
173
Lower
256k
115
Lowest
128k
56
PAL
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 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 16 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)
X16(channels)= 645120(MB)
≈650(GB)
Therefore, customers who install only one SATA HD with 750GB can expect to
achieve almost one month of recording time.
