How to check your MacBook's hard drive health before it's too late
macOS offers both built-in and paid tools to catch storage problems early and avoid permanent data loss. Regular backups remain the single most important safeguard.
A computer's storage is one of its most critical components. Unlike a cracked screen or broken keyboard, a failing drive can mean permanently losing files if there's no backup in place.
That's why the first line of defense is regular backups. Apple's built-in Time Machine tool saves files, apps and other data that iCloud doesn't cover — iCloud is useful for syncing and moving data between Apple devices, but it isn't a full backup of a Mac's drive. Experts recommend using a reliable external drive with at least twice the storage capacity of the Mac itself.
Warning signs
Trouble can show up as corrupted or disappearing files, apps that freeze, or a direct macOS notification that the storage needs servicing.
Disk Utility tools
For most people, the starting point is Disk Utility's First Aid feature, found under Applications > Utilities. After enabling "Show All Devices" in the menu, Apple recommends running First Aid in order — first on individual volumes, then the container, and finally the drive itself. A startup disk should be checked from macOS Recovery.
First Aid scans the file system and attempts to fix errors it finds, but it doesn't perform a full physical hardware check. For that, Disk Utility also displays a S.M.A.R.T. status, which tracks errors, failing sectors and signs of mechanical wear. A "verified" status doesn't guarantee everything is fine, but it does mean no serious problem has been flagged. This information appears when selecting the physical drive after turning on "Show All Devices."
Going deeper
For a more thorough check, paid third-party software such as DriveDx offers more detailed data than Disk Utility, runs SSD diagnostics and tracks changes over time. It's especially useful for external drives, which often don't show S.M.A.R.T. data in Disk Utility. Most users with a modern MacBook won't need such a tool, but it can be a worthwhile option for closely monitoring an internal SSD's condition.
