Symptom
You are unable to make aliases of volumes in the Computers directory.
Solution
Because users do not have write privileges to the Computers directory, the Make Alias command is not available. To make an alias to a volume that appears in the Computers directory, drag a volume's icon into an area to which you have write privileges, such as the desktop or the Favorites folder. Since a volume cannot be removed from the Computers directory, an alias is automatically created in the new location.