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68
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Appendix 3.Hard disk capability calculation
Make sure the hard disk installed to install the DVR for the first time. Pay attention to the IDE hard disk lines
connection.
1
、
Hard disk capability
There is no limit for recording machine. We recommend 120G~250G 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 MPEG4/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
：
The video files in each channel need 200M capability in an hour. For 4 channels and one month(24hours
a day) the needed hard disk capability is: 4channel*30days*24hours*200M/hour=576G. So it will need one
500G hard disks.
