Q: How to calculate the recording space occupation?
Answer:
Hard Disk Capability= (Bit Stream/8*Time)

 
FormatVideo flowOne dayOne weekOne month
1080P1-8M/s10.5G-84.4G73.5G-590.8G315G-2.5T
720P1-4M/s10.5G-42.2G73.5G-295.4G315G-1.24T
D10.5-2.5M/s5.3G-36.4G37.1G-254.8G159G-1092G
CIF0.18-1M/s540M-10.5G3.7G-73.5G111G-315G

CIF      64kbps-1024kbps          
D1      512kbps-2560kbps
720P    1024kbps-4096kbps        
1080P  1024kbps-8192kbps

The maximum capability of one set PC storage server:12*1.5TB=18TB
SATAII R&W speed: 40MB~60MB

If do not consider the hard disk capability, the server can hold up (40*8/2)=160CH 2Mb/s IP cameras to read and write simultaneously.
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