Why can't I find my hard drives on Mac mini?
check visible external hard disk check utility hard disk it still doesn't visible and work
[Re-Titled by Moderator]
Mac mini, macOS 15.4
What year model is the Mac mini...?
Identify your Mac mini model - Apple Support
What external hard drives and how are you connecting them to the Mac mini...?
(make, model) (adapter, dock, hub)