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QSD42908 User’s Manual
92
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
i
q that is the capacity of each channel
needed for every hour: unit Mbyte.
.
102436008 ¸´¸=
ii
dq (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 旚
i
h 旚
i
D (2)
In the formula:
i
h Represents the recording time for each day (hour)
i
D Represents number of days for which the video shall be kept
Step 3: Use Formula (3) to calculate total capacity (accumulation)
T
q that is needed for all
channels in the DVR during scheduled video recording.
å
=
=
c
i
iT
mq
1
(3)
In the formula:
c
represents total number of channels in one DVR
Step 4: Use Formula (4) to calculate total capacity (accumulation)
T
q that is needed for all
channels in DVR during alarm video recording (including motion detection).
å
=
=
c
i
iT
mq
1
旚a% (4)
In the formula：a% means alarm occurrence rate