After Smart Security 5 installation the system would hang when an old USB external drive was plugged in. A newer SimpleTech 500GB portable drive would not hang the system when it was plugged in. The solution turned out to be in the BIOS of the system. The BIOS USB Legacy Support was "Disabled" and the system would hang. The BIOS USB support was changed to have USB Legacy Support "Enabled" and the system would operate properly without a hang. (FYI: the system is an old Fujitsu laptop).