User Manual for Commercial Series Net DVR

Appendix A HDD Capacity Calculation

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

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

channel needed for every hour, unit Mbyte.

qi = di ÷ 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 storage of each channel needed in Mbytes.

mi

= qi × hi × Di

(2)

In the formula:

 

hi

means the recording time for each day (hour)

 

Di

means number of days for which the video shall be kept

 

Step 3: According to 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 means total number of channels in the DVR

Step 4: According to 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 formulaa% means alarm occurrence rate

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Q-See QSF2648008, QSF2648016, QSC26416, QSD42208, QSC26408 user manual Appendix a HDD Capacity Calculation, = d i ÷ 8 × 3600 ÷

QSC26408, QSC26416, QSF2648016, QSD42208, QSF2648008 specifications

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