If you don’t want your users to see the virtual disk tray notification icon then you can remove this quite easy with the following registry key:
HKLMsoftwarecitrixProvisioningServicesStatusTray Key "ShowIcon" and set the value to 0.
Caution! This fix requires you to edit the registry. Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it