QSD2316L DVR User’s Manual
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Appendix B Calculate Recording Capacity
Users can calculate the size of hard drive needed based on DVR recording settings. The DVR uses fixed video bit rate.
Below is the space used at different settings.
Video
Format
Resolution
Frame Rate
Total(FPS)
Video Quality
Bit Rate
(kbps)
Storage Used
(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
For example, if a customer uses NTSC cameras, sets resolution to CIF, video quality to Lower, frame rate to 240fps for
16ch total, and he wants the unit to continuously record for a month, below is the calculation:
Storage used in a day: 112.5X24(h)X(240fps/30fps)
≈
21GB
Storage used in 30 days: 21X30
≈
630GB
So the customer must install SATA HDDs with 630GB capacity for it to record a month.
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