37
Appendix A: Calculational Methods of Total Harddisk Capacity
Base on the record schedule, you can calculate the total capacity of a DVR.
The calculational methods
：
Step 1
：
Use the formula (1) to calculate the storage capacity
i
q
of a single channel in a hour, units: MByte.
1024
3600
8
÷
×
÷
=
i
i
d
q
（
1
）
thereinto
：
i
d
－
bit rate, units: Kbit/s
Step 2
：
Make sure the record schedule
，
use the formula (2) to calculate the storage capacity
i
m
of a single channel,
units: MByte
。
i
m
=
i
q
×
i
h
×
i
D
（
2
）
thereinto
：
i
h
－
recording time per day, units: hour
i
D
－
days for saving the kinescope
Step 3
：
use the formula (3) to calculate the total capacity
T
q
of all channels.
∑
=
=
c
i
i
T
m
q
1
（
3
）
thereinto
：
c
— the total number of channels with a DVR
