The pattern files can be removed to free some disk space.
To remove the pattern from the server:

1. Stop the OfficeScan Master Service.
2. Delete the following files:
    

   It is possible that some files are unavailable.
   • \PCCSRV\*.ptn
   • Smart Scan Agent Patterns
     \PCCSRV\icrc$oth.*
   • Conventional Scan Agent Patterns
     \PCCSRV\lpt$vpn.*
   • IntelliTrap Exception Patterns
     \PCCSRV\tmwhite.*
   • IntelliTrap Patterns
     \PCCSRV\tmblack.*
   • Spyware Patterns
     \PCCSRV\ssaptpn.*
   • Virus Cleanup Template
     \PCCSRV\Admin\tsc.ptn
   • \PCCSRV\Download\*.*
   • \PCCSRV\TEMP\*.*
   • \PCCSRV\wss\activeupdate\*.*
   • \PCCSRV\wss\patterns\*.*
   • \PCCSRV\wss\x64\LWCS\wcspatterns\*.*
3. Restart the OfficeScan Master Service or reboot the server.

You should be able to download the pattern again.