Q-See QC40198 - Manual (Page 137)

APPENDIX A
QC40198 User Manual
128 | P a g e
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.
1024 3600 8
ч Ч ч =
i i
d q (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.
i
m =
i
q ×
i
h ×
i
D (2)
In the formula:
i
h means the recording time for each day (hour)
i
D 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.
∑
=
=
c
i
i T
m q
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)
T
q that is needed for all channels in
DVR during alarm video recording (including motion detection).
∑
=
=
c
i
i T
m q
1
×a% (4)
In the formula: % means alarm occurrence rate