Q-See QSTD2408 - Manual (Page 68)

Digital Video Recorder User Manual
64
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
Format
Resolution
Frame
Rate Total
(FPS)
Video Quality
Bit Rate
(kbps)
Used
Space
(MB/h)
Highest 640 281
Higher 512 225
Medium 384 168.7
Lower 256 112.5
PAL CIF 25
Lowest 128 56
Highest 640 281
Higher 512 225
Medium 384 168.7
Lower 256 112.5
NTSC CIF 30
Lowest 128 56
The calculation formula is:
Total Recording capacity =Used space per hour (MB/h) (coverage rate
of hard drive) × recording time (hour)
×channel numbers
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 capacity =112.5(mb/h) X 24(hours/day) X30(days)
X8(channels)
= 648000(MB)
= 648(GB)
In this case if you would install two 320GB SATA HDDs, it can almost record for one
month.
For 4-channel DVR:
Total Recoding capacity =112.5(mb/h) X 24(hours/day) X30(days)
X4(channels)
= 324000(MB)
= 324(GB)
If you install one 320GB SATA HDD, it can almost record one month.