Only the specific reference platforms, to the specified configurations, are tested and supported for CiscoWorks HSS 1.9. Because of issues with OS device driver support and tested performance characteristics, variations from the specified configurations of the supported reference platforms may render CiscoWorks HSS 1.9 partially or fully inoperable. For instance, changing the hardware configuration from the specification could require additional device drivers not available from CiscoWorks HSS install and thus cause the installation to fail. This is especially true with respect to fixed disk drivers