Q-See QSTD2416, QSTD2408, QSTD2404 Appendix C Calculating Recording Capacity, For 4-channel DVR

QSTD2400 Series DVR User’s 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		Frame		Bit Rate	Used
	Resolution	Rate Total	Video Quality		Space
Format				(kbps)
		(FPS)			(MB/h)
			Highest	640	281
			Higher	512	225
PAL	CIF	25
			Medium	384	168.7
			Lower	256	112.5
			Lowest	128	56
			Highest	640	281
			Higher	512	225
NTSC	CIF	30
			Medium	384	168.7
			Lower	256	112.5
			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)

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