5
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
i
that is the capacity of each
channel needed for each hour, unit
Mbyte.
q
i
d
i
8 3600 1024
(1)
In the formula: d
i
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
i
, which is storage of each channel needed unit Mbyte.
m
i
= q
i
× h
i
×
D
i
(2)
In the formula:
h
i
means the recording time for each day (hour)
D
i
means number of days for which the video shall be kept
Step 3: According to Formula (3) to calculate total capacity
(accumulation) q
T
that is needed for all
channels in the DVR during scheduled video recording.
q
T
m
i
i 1
(3)
In the formula: c means total number of channels in one DVR
Step 4: According to Formula (4) to calculate total capacity
(accumulation)
q
T
that is needed for all
channels in DVR during alarm video recording (including motion detection).
q
T
m
i
×a% (4)
i 1
In the formula：a% means alarm occurrence rate
You can refer to the following sheet for the file size in one hour per channel. (All the data
listed below are for reference only.)
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