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QSD42908C8 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

that is the capacity of each channel

needed for every hour: unit Mbyte.

102436008 ÷×÷=

(1)

In the formula:

means the bit rate, unit Kbit/s

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

storage capacity

, which is storage of each channel needed unit Mbyte.

(2)

In the formula:

Represents the recording time for each day (hour)

Represents number of days for which the video shall be kept

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

that is needed for all

channels in the DVR during scheduled video recording.

∑

(3)

In the formula:

represents total number of channels in one DVR

Step 4: Use 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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Q-See QSD42908 Net Manual de usuario Pagina 92