To recover files from a corrupted external hard drive, first stop using it so nothing overwrites your data, then try a different cable and USB port. If the drive is detected, run a repair tool (chkdsk on Windows or First Aid on Mac) and copy files off. If repair fails, use data recovery software. If the drive clicks or is not detected at all, the failure may be physical, and a professional service is the safer option.
Why this happens
Corruption falls into two broad types, and the right response depends on which you have.
- Logical corruption: the hardware still works, but the file system or partition table is damaged from unsafe removal, a crash, power loss, or malware. The drive is usually detected but shows as RAW, empty, or unreadable. This is often recoverable at home.
- Physical failure: a mechanical or electronic fault such as failed read heads or a dying motor. Signs include clicking or beeping, the drive not spinning up, or not appearing at all. Home software cannot fix this and repeated attempts can make it worse.
Is this normal?
Drives do fail, and corruption after a bad disconnect or power cut is common. It is not something you caused by normal use in most cases, but it is a strong signal to improve your backups going forward.
Does it cause any problems?
Yes. Beyond losing access to your files, continuing to write to a corrupted drive can permanently overwrite recoverable data. Every action you take should avoid writing to the affected drive.
How to fix or check it
- Stop writing to the drive: do not save, install recovery tools onto, or reformat the affected drive. Install any software on a different disk.
- Rule out the cable and port: try a different cable, a different USB port, and another computer. A faulty cable or port often mimics a corrupt drive.
- Listen and watch: if you hear clicking, grinding, or repeated spin up and down, stop. That points to physical failure, and only a professional cleanroom service should continue.
- Repair on Windows: if the drive is detected, open Command Prompt as administrator and run
chkdsk X: /f(replace X with the drive letter). If files reappear, copy them to a healthy drive immediately. - Repair on Mac: open Disk Utility, select the drive, and run First Aid. If it mounts, copy files off right away.
- Use recovery software: if repair does not work, run reputable data recovery software to scan the drive and save recovered files to a different disk, never back to the failing one.
- Consider professional recovery: for physical failures or irreplaceable data, a professional recovery lab is the safest choice, though it costs more.
Frequently asked questions
Should I reformat the drive to fix corruption?
Not before recovering your data. Reformatting can overwrite the very files you want back. Recover first, then reformat only if you plan to reuse the drive.
My drive clicks. Can software recover it?
Usually not. Clicking often means a mechanical fault, and running software or powering it repeatedly can cause more damage. A professional recovery service is the safer path.
Why does the drive show as RAW?
RAW means the computer can see the drive but not read its file system, usually due to logical corruption. Recovery software can often still read the raw data and rebuild files even when the file system is unreadable.