Appendix A Hdd Capacity Calculation - Amcrest NVR11H Series User Manual

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Appendix A HDD Capacity Calculation

Calculate the total capacity needed by each device according to video recording (video recording type
and video file storage time).
Step 1: Formula (1) is used to calculate the storage capacity
needed for each hour in Mbytes.
Step 2: After the video time requirement is confirmed, formula (2) is used to calculate the storage
m
capacity , which is storage of each channel needed in Mbytes.
i
Step 3: Formula (3) is used to calculate the total capacity (accumulation)
channels in the device during scheduled video recording.
Step 4: Formula (4) is used to calculate the total capacity (accumulation)
channels in device during alarm video recording (including motion detection).
q
i
d
In the formula: is the bit rate in Kbit/s
i
m
In the formula:
h
is the recording time for each day (hour)
i
D
is the number of days for which the video will be kept
i
c
In the formula: is the total number of channels in one device
In the formula: a% is the alarm occurrence rate
q
; that is the capacity of each channel
i
   
d 8 3600 1024
i
q h D
= × ×
i i i i
c


q m
T i

i 1
c


q m
×a%
T i

i 1
q
that is needed for all
T
q
that is needed for all
T
190
(1)
(2)
(3)
(4)