Question—internal HD on desktop

[modelamac]

clyde wrote:
When booting from an external HD, the iMac's internal HD does not appear on the desktop.

Guess that means it's not accessible.

Why not?

It does not mean it is not accessible. It means you don't have hard drives showing in the Finder.

Open Finder Preferences (or click on your Desktop and then Cmd comma).

Select the "Sidebar" tab.

Check the boxes for what you want to happen/see.

Done.