Check your disk’s health

Disk Utility → select the disk → First Aid checks it for errors. For the drive’s own verdict, diskutil info reports its SMART status: “Verified” means it reports no problems.

Without Terminal

Open Disk Utility.
Select the disk in the sidebar.
Click First Aid → Run.

In one command

The drive’s own health report:

diskutil info / | grep -E 'SMART Status|Solid State'

“Failing” means copy anything important off it today. “Not Supported” is normal for many external drives.

Or just ask Titan

Is my disk healthy? Do it with Titan

Titan is an AI that lives on your computer: tell it what you need and it does it while you watch — you press Return, nothing runs by itself. What is Titan?

Titan isn’t on this computer yet. Get Titan, then press the button again — the task will be waiting, typed in.

Related

See how much storage is left Check your laptop battery health