Disk Capacity Is Correct but Every Folder Gives an I/O Error

A drive can identify its capacity correctly while reads fail across its folders. Capacity detection does not demonstrate that the file data is readable.

What to check first

Record whether errors occur on one file, one directory, or nearly every access. Broad read failures need more caution than a single damaged document.

A practical recovery sequence

1. Locate and preserve the evidence. Stop repeated browsing and copying attempts. Check a known-good cable or port once if the device is stable and externally connected.
2. Check the most relevant recovery source. If errors persist, preserve the disk and consult a recovery specialist for valuable data. Controlled imaging may be appropriate for qualified users, but a failing device can worsen under load.
3. Keep a separate working copy. Work with a readable image or recovered copy before filesystem repair. Prioritize irreplaceable files rather than repeatedly retrying a large replaceable folder.

Keep the recovery attempt reversible

Device identification comes before repair. Record the model, capacity, and connection so that source and destination cannot be confused. Recovery output must go to separate healthy storage. A device that clicks, repeatedly disconnects, or develops read errors needs a different plan from a healthy disk with an accidental deletion. For valuable data, professional assessment can be preferable to repeated experimentation. Neither a successful mount nor a long list of scan results guarantees that file contents are intact.

How to verify the result

Check the recovered content itself and retain any read-error report to identify uncertain areas.

Record which files you checked and which remain uncertain. Keep unverified candidates separate from files you have confirmed are usable; that distinction matters if someone else needs to continue the work.

The mistake to avoid

Do not run long surface tests or repeated repair passes before protecting the only copy of important files.

If files are still missing

For an actual deletion from a stable, accessible local device, Drecov’s data recovery resources provide another starting point. If you choose to evaluate its software, use the Drecov download, confirm support for your device and filesystem, and keep installation and recovered output off the affected storage. Recovery is not guaranteed. Software cannot substitute for missing encryption credentials, cloud permissions, or unreadable hardware.

Browse related data recovery guides for other storage situations. For platform-specific controls, use the official references below; menu names and available recovery options vary with application, account, and operating-system version.

References and further reading

• CGSecurity: disk imaging and damaged storage
• Apple: what erasing and reformatting a disk does