See connected disks, iOS devices, and servers
You can view icons for hard disks, external disks, CDs, DVDs, iOS devices, and connected servers in the Finder sidebar or on your desktop.
In the Finder, choose Finder > Preferences.
Click General, then select the items you want to see on the desktop.
For example, if you select “CDs, DVDs, and iPods,” then you connect your iPod, its icon appears on your desktop.
Click Sidebar, then select the items you want to see in the Finder sidebar.
Some items are listed below Shared, and others are listed below Devices.
For more information about setting Finder preferences, see Finder preferences.