A failing drive may become slow, disappear, report errors, corrupt files, prevent startup, or make unusual mechanical noises.
What this usually means
Data preservation comes before making the computer boot. If storage clicks, disappears, reports errors, or contains the only copy of important files, repeated restarts and repair utilities may increase risk.
Practical checks and decisions
Back up immediately when the drive still reads normally
For “back up immediately when the drive still reads normally,” identify the only original copy before changing the computer. When the storage is stable, make an independent copy and open several representative files so a sync icon is not mistaken for a verified backup.
Stop using a drive that clicks, scrapes, or repeatedly disconnects
Approach “stop using a drive that clicks, scrapes, or repeatedly disconnects” by separating source, backup, and destination. Compare file counts and recent folders, keep the old copy untouched until verification is complete, and avoid repair tools when a drive disappears, clicks, or contains irreplaceable data.
Do not format storage that contains the only important copy
Before “do not format storage that contains the only important copy,” write down what matters most and where it currently lives. That inventory keeps photos, documents, browser exports, email archives, and application data from being overlooked during how to tell if your hard drive is failing.
Separate drive replacement from data-recovery decisions
Finish “separate drive replacement from data-recovery decisions” with a restore test rather than an assumption. Open files from the backup, confirm dates and folder structure, and retain an independent copy until the new location has been used successfully.
When a professional diagnosis makes sense
Ask for help before formatting, initializing, repeatedly restarting, or running repair tools against the only copy of important files. The safest recovery path depends on the storage symptoms and value of the data.
For hands-on or remote help, review the related service, or browse the Help Center for another guide.
