Digital Video Recorder User Manual
96
Appendix B Calculate Recording Capacity
Make sure the hard disk formatted and installed to the DVR for the first time.
1
、
Hard disk capability
There is no limit for recording machine. We recommend 500G~2048G size to keep
better stability.
2
、
Overall capability option
The hard disk capability formula is:
Overall capability
（
M)=channel number*time
（
hour)*capability in an hour
（
M/hour)
The recording time formula is:
Recording time
（
hour)=
overall capability
（
M)
Capability in an hour
（
M/hour)*channel number
The DVR introduces the H.264 compression technology. Its dynamic range is very
large so the hard disk capability calculation is based on the estimation values of each
channel creating files in an hour.
Example:
For one piece 500G HDD, real time CIF for recording, it will keep recording for about
25 days.HDD spaces per channel is 200M/H, if 4channels real time CIF at 24hours
recording uninterrupted, it can last:500G/(200M/H*24H*4ch)=26 days
