QSC26404 User’s Manual
82
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.
1024
3600
8
÷
×
÷
=
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 the storage needed by each channel: unit Mbyte.
i
m
=
i
q
×
i
h
×
i
D
(2)
In the formula:
i
h
represents the recording time for each day (hours)
i
D
represents the number of days for which the video will 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
.
∑
=
=
c
i
i
T
m
q
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)
.
∑
=
=
c
i
i
T
m
q
1
×
a%
(4)
In the formula
：
a%
represents alarm occurrence rate
