Appendix A Hdd Capacity Calculation - Jaycar Electronics DS-8704HI-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).
Step 1: According to Formula (1) to calculate storage capacity
of each 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
= × ×
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


q
T

i
c
In the formula: means total number of channels in one DVR

q
T
In the formula: a% means alarm occurrence rate
121
q

1024
D
i
c
m
i
1
c

m
×a%
i

i 1
that is the capacity
i
(1)
(2)
q
that is
T
(3)
q
that is
T
(4)