This Might Help
Hi,
I had a similar problem and posted on another forum. A good smaritan helped me to find a solution and it turned out to be really simple!🙂
Do this - Make an alias of your mac hard drive icon on the desktop (do it by right-click or control-click on the Icon and choose "Make Alias" from the drop down menu). Then, go to Finder menu and under Prefrences -> go to "General" tab and uncheck the box for "Hard Disks" under "Show these items on Desktop". You would still have the alias on the desktop, but other icons will disappear.
Hope this works for you.
Bye
G