See the devices connected to your Mac
You can view icons for hard disks, external disks, CDs, DVDs, iPhone, iPad, iPod touch, and connected servers in the Finder sidebar or on your desktop.
In the Finder on your Mac, choose Finder > Preferences.
Click General, then select the items you want to see on the desktop.
For example, if you select “Hard disks,” icons for your hard disks appear on your desktop.
Click Sidebar, then select the items you want to see in the Finder sidebar.
Some items are listed below Favorites, and others are listed below Locations.
For more information about setting Finder preferences, see Change Finder preferences.