Thank you for the reply, this is a dev question seeking for any flag or config to prevent erasing a read-only volume like mounting approval API or noexec or ronly params when remount, any thoughts? Thanks.

Thank you, but this is a dev question seeking for the flag to prevent or stop the erasing operation like unmounting approval to return not permit.

Thanks, I am just wondering if it is not allowed or not the good timing to quit, why not gray out that dock menu item to reduce confusion, not only with unsaved context, also some scenarios like installing progress, upgrading etc. Protecting quitting via a 3rd party application may not help, it makes sense if there is no solution programmatically achieve this, thanks for the comment.