You can easily change your Computer HDD Drives icons, by following few easy steps.
First for all you will need the Icon file which you want to set it as your computer HDD Drive icon.
When you are ready with the icon just copy the icon file in the drive which you want to set the icon.
Just open notepad and type
Wheel.ico is the icon file name which I have placed it into my drive. After you add the code to the text file just save it as autorun.inf.
After you are done with the saving it just restart your computer, after you restart it will start showing the icon file which you have selected, as you can see in below screenshot.
You can also change Removable Flash Drive icon also by following same process.