Built-in tools in Windows and macOS can help users test memory and hard-drive health

For Windows, the built-in Windows Memory Diagnostic utility runs a series of tests to verify that RAM can store and return data reliably. RAM issues often show up as slow performance, app crashes, unexpected restarts and blue-screen errors. The tool works outside the regular Windows environment, so users should save all work before launching it. It can be started by searching for "Windows Memory Diagnostic" in the Start Menu or by running mdsched.exe from the Run dialog. After the computer restarts, the utility begins testing automatically. Pressing F1 allows users to choose between Basic, Standard and Extended test mixes, and to set the pass count up to 15.

After the test is complete, Windows restarts normally. The results do not always appear automatically, despite what the tool says. Users can find them in Event Viewer by filtering the System log and selecting the MemoryDiagnostics-Results event source. A result that says no errors were found does not completely rule out memory issues; the guide suggests re-running the test with the Extended mix and a higher pass count if problems persist. If hardware errors are detected, users may try testing each RAM stick individually or disable XMP/EXPO profiles in the BIOS that can push memory beyond its default specifications.

For Mac users, Apple's Disk Utility offers First Aid and S.M.A.R.T. status to check the file system and basic drive health. The guide recommends running First Aid on individual volumes first, then the container, then the physical drive. For a startup disk, Apple recommends doing this from macOS Recovery. First Aid checks the file system for errors and attempts fixes, but it does not give the drive a full physical checkup. S.M.A.R.T. status can be viewed by selecting the physical drive in Disk Utility with View > Show All Devices enabled. A "verified" S.M.A.R.T. status means the drive has not flagged a serious problem, but it does not guarantee all is well.

For deeper hardware diagnostics on a Mac, the guide says third-party software like DriveDx can provide more detailed S.M.A.R.T. data, SSD diagnostics and monitoring over time. It is especially useful for external drives, where Disk Utility may not show S.M.A.R.T. data. For most users, the guide says Disk Utility's built-in tools are enough, and DriveDx is more of a luxury than a necessity.

Both guides stress that regular backups are the best protection against data loss. Apple's Time Machine backs up files, apps and other data that iCloud omits, and the guide recommends using an external drive with at least twice the Mac's storage. Signs of Mac storage trouble can include corrupted or missing files, frozen apps, or a message from macOS that the drive needs servicing.