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 i q that is the capacity
of each channel needed for each hour, unit Mbyte.
q
1
= d
1
÷ 8 x 3600 ÷1024 (1)
In the formula: i 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 i m , which is storage of each channel needed unit
Mbyte.
m
1
= q
1
× h
1
× D
1
(2)
In the formula:
h
1
means the recording time for each day (hour)
D
1
means number of days for which the video shall
be kept
Step 3: According to Formula (3) to calculate total capacity (accumulation) T q that is
needed for all channels in the DVR during scheduled video recording.
(3)
In the formula: c 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).
(4)
In the formula：a% means alarm occurrence rate
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