Appendix B: Calculate Recording Capacity - Q-See QT428 User Manual

APPENDIX B

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
RESOLUTION
FORMAT
NTSC CIF
PAL CIF
The calculation format is:
Total Recording capacity =Used space per hour (MB/h) (coverage rate of hard drive) × recording time
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)
Therefore, customers who install only one SATA HD with 320GB can expect to achieve almost one month of
recording time.
RECORDING CAPACITY
:
FRAME RATE (FPS)
30
25
(hour) ×channel numbers
= 322560(MB)≈315(GB)
VIDEO
QUALITY
Highest
Higher
Medium
Low
Lower
Lowest
Highest
Higher
Medium
Low
Lower
Lowest
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QT426 User Manual
BIT RATE SPACE USED
(kbps) (MB/h)
1M 465
768k 297
512k 230
384k 173
256k 115
128k 56
1M 466
768k 295
512k 235
384k 175
256k 56.4
128k 45