Free & Zero Page List Bytes is the amount of physical memory, in bytes, that is assigned to the free and zero page lists. ...

Free & Zero Page List Bytes is the amount of physical memory, in bytes, that is assigned to the free and zero page lists. This memory does not contain cached data. It is immediately available for allocation to a process or for system use. For a full explanation of the memory manager, refer to MSDN and/or the System Performance and Troubleshooting Guide chapter in the Windows Server 2003 Resource Kit.