macOS Error Code -36: How to Fix It

Q: What does macOS Error -36 mean exactly?

Error -36 (ioErr) is an input/output error that means macOS cannot read from or write to a file or storage location. It typically occurs due to corrupted files, permission issues, insufficient disk space, or hardware problems with your storage device.

Q: Why do I keep getting Error -36 when copying from external drives?

External drives often contain files with naming conventions or hidden system files that conflict with macOS. This is especially common with drives that have been used on Windows systems, which create dot-underscore files that can cause copying errors on Mac.

Q: Can Error -36 cause permanent data loss?

Error -36 itself doesn't delete files, but it indicates potential data corruption. The files causing the error may already be damaged. Always back up important data immediately when you encounter this error, and avoid repeated copy attempts that might worsen corruption.

Q: Is Error -36 related to hardware failure?

While Error -36 can indicate failing storage hardware, it's more commonly caused by software issues like corrupted files or permission problems. If the error persists after software troubleshooting and affects multiple files, consider having your drive tested for hardware failure.

Q: How can I prevent macOS Error -36 in the future?

Keep your Mac updated, maintain adequate free disk space (at least 10-15%), regularly run First Aid on your drives, avoid force-shutting down during file operations, and safely eject external drives before disconnecting them.

Abstract

macOS Error -36 (also known as ioErr) occurs when your Mac cannot copy, move, or delete files due to data corruption, permission issues, or storage problems. This error typically appears when transferring files between drives or attempting to access damaged files on your system.