Security logs not overwrite

Question

Hi
I have windows server 2012
I configure the security log with size 4 GB and override but I find that after the log file reach 4 GB they archive it and create another one although I configured to overwrite not archive  .
what shall the reason ?
I really confused .
MCP MCSA MCSE MCT MCTS CCNA

Answer 1

The 'r' parameter specifies whether to retain the log and the 'ab' parameter specifies whether to automatically back up the log. The following list shows the parameter values of the Wevtutil command-line tool that correspond to each of the above retention policies.
Overwrite events as needed: r = false, ab = false
Archive the log when full, do not overwrite events: r = true, ab = true
Do not overwrite events. (Clear logs manually.): r = true, ab = false
REF: https://technet.microsoft.com/en-us/library/cc721981.aspx?f=255&MSPPError=-2147217396
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Hello
in the below u can see
C:\Users\bkupofc>wevtutil gl Security
name: Security
enabled: true
type: Admin
owningPublisher:
isolation: Custom
channelAccess: O:BAG:SYD:(A;;CCLCSDRCWDWO;;;SY)(A;;CCLC;;;BA)(A;;CC;;;ER)(A;;CC;
;;NS)
logging:
  logFileName: %SystemRoot%\System32\Winevt\Logs\Security.evtx
  retention: false
  autoBackup: false
  maxSize: 4429185024
publishing:
  fileMax: 1
C:\Users\bkupofc>
and still the logs not overwritten , please advice . 
MCP MCSA MCSE MCT MCTS CCNA