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QSD2308L/QSD2316L DVR User’s Manual
70
Appendix B Calculating 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.