APPENDIX B
:
RECORDING CAPACITY
QT426 User Manual
94 |
P a g e
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
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.