XtendLan HVR-1608PK, User Manual

Page: 176 / 193

166
Bit stream size
（
max
）
File size
Bit stream size
（
max
）
File size
96K 42M 128K 56M
160K 70M 192K 84M
224K 98M 256K 112M
320K 140M 384K 168M
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
q
i
that is the capacity of
each channel needed for each hour, unit Mbyte.
q
i
=
d
i
÷
8
×
3600
÷
1024 (1)
In the formula:
d
i
means the bit rate, unit Kbit/s
Step 2: After video time requirement is confirmed, according to Formula (2) to calculate
the storage capacity
m
i
, which is storage of each channel needed unit Mbyte.
m
i
=
q
i
×
h
i
×
D
i
(2)
In the formula:
h
i
means the recording time for each day (hour)
D
i
means number of days for which the video shall be
kept
Step 3: According to Formula (3) to calculate total capacity (accumulation)
q
T
that is
needed for all channels in the DVR during scheduled video recording .
c
q
T
=
∑
m
i
i = 1
(3)
In the formula:
c
means total number of channels in one DVR
Step 4: According to Formula (4) to calculate total capacity (accumulation)
q
T
that is
needed for all channels in DVR during alarm video recording (including motion
detection) .
c
q
T
=
∑
m
i
×
a% (4)
i
=
1
In the formula
：
a% means alarm occurrence rate
You can refer to the following sheet for the file size in one hour per channel. (All the data
listed below are for reference only.)