Appendix A Hdd Capacity Calculation - Securitytec DS-8004HCI-S User Manual

Appendix A HDD Capacity Calculation

Calculate total capacity needed by each DVR according to video recording (video
recording type and video file storage time).
According to Formula (1) to calculate storage capacity
channel needed for every hour, unit Mbyte.
Step 2: After video time requirement is confirmed, according to Formula (2) to
calculate the storage capacity
kept
Step 3: According to Formula (3) to calculate total capacity (accumulation)
needed for all channels in the DVR during scheduled video recording.
Step 4: According to Formula (4) to calculate total capacity (accumulation)
needed for all channels in DVR during alarm video recording (including motion
detection).
  
q d 8 3600
i i
d
In the formula: means the bit rate, unit Kbit/s
i
m
, which is storage of each channel needed unit Mbyte.
i
m q h D
= × ×
i i i
In the formula:
h
means the recording time for each day (hour)
i
D
means number of days for which the video shall be
i
c


q
T

i 1
c
In the formula: means total number of channels in one DVR
c


q
T

i
In the formula: a% means alarm occurrence rate
131
q
that is the capacity of each
i

1024
i
m
i
m ×a%
i
1
(1)
(2)
q
that is
T
(3)
q
that is
T
(4)