Mac Error 4302 — Disk Utility First Aid Process Has Failed

Mac error 4302 in Disk Utility indicates First Aid could not repair the disk, typically due to severe filesystem corruption requiring more aggressive repair. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Disk Utility First Aid runs fsck (file system check) underneath. Error 4302 means the repair process itself encountered a fatal error. More common with APFS volumes than HFS+. May indicate hardware-level disk failure. Data recovery should be prioritized before further repair attempts. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Severe APFS or HFS+ filesystem corruption. Failing SSD or HDD with bad sectors. Unexpected power loss during write operations. Corrupted APFS container metadata. Multiple filesystem errors compounding during repair. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Boot into macOS Recovery (Command+R on Intel, hold power on Apple Silicon). Run First Aid from Recovery Disk Utility on the specific volume. If First Aid fails again, try from Terminal in Recovery: diskutil repairVolume /dev/diskXsY. For APFS: fsck_apfs -y /dev/diskXsY from Recovery Terminal. If all repairs fail, back up data with Target Disk Mode and erase/reinstall. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Mac Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.