Appendix C Calculating Recording Capacity - Q-See QSTD2404 User Manual

Appendix C
Calculating Recording Capacity
Users can calculate the size of hard drive needed according to the saving
time and DVR recording settings. The DVR uses fixed video bit rate. Below are the
details for different settings for 200 fps 8-channel DVR.
Video
Resolution
Format
PAL CIF
NTSC CIF
The calculation formula is:
Total Recording capacity =Used space per hour (MB/h) (coverage rate
For instance, if you use NTSC cameras, set resolution to CIF, video quality to Lower,
frame rate to 240 fps for enabling a total of 8 channels and you want the unit to
record continuously for a month. Below is the calculation:
Total Recoding
In this case if you would install two 320GB SATA HDDs, it can almost record for one
month.
For 4-channel DVR:
Total Recoding
If you install one 320GB SATA HDD, it can almost record one month.
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Digital Video Recorder User Manual
Frame
Rate Total
Video Quality
(FPS)
Highest
Higher
25 Medium
Lower
Lowest
Highest
Higher
30
Medium
Lower
Lowest
of hard drive) × recording time (hour)
×channel numbers
capacity =112.5(mb/h) X
X8(channels)
= 648000(MB)
= 648(GB)
capacity =112.5(mb/h) X
X4(channels)
= 324000(MB)
= 324(GB)
Used
Bit Rate
Space
(kbps)
(MB/h)
640 281
512 225
384 168.7
256 112.5
128 56
640 281
512 225
384 168.7
256 112.5
128 56
24(hours/day) X30(days)
24(hours/day) X30(days)