Q-See QH32DVR4C user manual Appendix B HDD Capacity Calculation, = d i ⎟ 8 ⋅ 3600 ⎟1024

QH32DVR4C User’s Manual

Appendix B: HDD Capacity Calculation

To calculate total capacity needed by each DVR according to video recording (video recording type and video file storage time).

Step 1: Use Formula (1) to calculate storage capacity qi that is the capacity of each channel

needed for every hour: unit Mbyte.

qi = d i ⎟ 8 ⋅ 3600 ⎟1024 (1)

In the formula: di means the bit rate, unit Kbit/s

Step 2: After video time requirement is confirmed, according to Formula (2) to calculate the

storage capacity mi , which is the storage needed by each channel: unit Mbyte.

	mi = qi × hi × Di	(2)
	In the formula:
hi	Represents the recording time for each day (hours)
Di	Represents the number of days for which the video will be kept
Step 3: Use Formula (3) to calculate total capacity (accumulation) qT		that is needed for all
channels in the DVR during scheduled video recording.
	c
	qT = ∑mi	(3)

i =1

In the formula: c represents total number of channels in one DVR

Step 4: Use Formula (4) to calculate total capacity (accumulation) qT that is needed for all

channels in DVR during alarm video recording (including motion detection).

c
qT = ∑mi	a%	(4)
i =1	×

In the formula a% represents alarm occurrence rate

：

82