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Appendix A HDD Capacity Calculation

Calculate total capacity needed by each DVR according to video recording (video recording type

and video file storage time).

Step 1: According to Formula (1) to calculate storage capacity

q that is the capacity of each

channel needed for each hour, unit Mbyte.

102436008

dq (1)

In the formula:

d means the bit rate, unit Kbit/s

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

storage capacity

m , which is storage of each channel needed unit Mbyte.

m =

q ×

h ×

D (2)

In the formula:

h means the recording time for each day (hour)

D means number of days for which the video shall be kept

Step 3: According to Formula (3) to calculate total capacity (accumulation)

that is needed for

all channels in the DVR during scheduled video recording.

∑

(3)

In the formula:

means total number of channels in one DVR

Step 4: According to Formula (4) to calculate total capacity (accumulation)

that is needed for

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

∑

×a% (4)

In the formula：a% means alarm occurrence rate

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