Installer fails: Can't mount bootfs

Installing 2017.08-1-HDD on ATV1 from USB. I get the message “Install Failed: Can’t mount Bootfs”

Anyone else experience this?

Did you remove the USB after prompted to do so?

During the boot from USB on ATV1? I never saw a prompt to remove the USB.

If you are installing to HDD, you’ll see a prompt to remove USB. You then reboot and install continues from HDD.