You need to run Disk Utility again and try to repair the damaged disk. It means the disk has not been fully repaired. Result 3: Get 'The underlying task reported failure' errors. If not, check the file content and decide if you can delete it. Check each of them to see if you can replace or recreate it. It means two or more files occupy the same space on your disk. Result 2: You will get 'overlapped extent allocation' errors. Then you will receive message like 'The volume (the name of disk) appears to be OK'. Result 1: Nothing is wrong or no errors needed to be repaired. Click Done button to finish disk repairing when First Aid process is complete.Īt last, you will get three results generally after First Aid process. First Aid will run and check out the possible errors on preferred disk.Ĥ. Continue while you get a prompting message from First Aid.ģ. Click the First Aid on the top menu and tap on Run button to launch First Aid on Mac.Ģ. Step 3: Run First Aid to check and repair disk errors.ġ. Just click the corrupted or damaged disk from the left pane, or any other drives you want to repair.īefore checking and repairing disk errors, you can see the selected disk whether it can be verified or repaired by clicking ' Info' from top menu. In the left pane, there lists the Mac startup disk and other connected drives. Step 2: Choose the disk you need to repair. Choose the Disk Utility and click Continue to open it. Start Mac in recovery mode and you could see four options that it provides to resolve hardware or software issues. Step 1: Get to Disk Utility on Mac startup. Now let's see how Disk Utility checks and repairs disk errors. And utilities available in Mac recovery boot, such as Disk Utility, reinstall macOS etc could fix the disk issues. Way 1: Repair Disk Errors with Disk Utility in Mac Recovery ModeĪs we know, while your Mac cannot boot normally, several boot options can help to fix problems. Way 2: File system check in single user mode.Otherwise, not only you cannot boot Mac, but also you will lose many important files or folder on Mac.įortunately, two built-in utilities have been created in Mac for the problem. So it is urgent to check out the disk errors and repair them in time while you encounter this problem. Undoubtedly, there are lots of reasons that can lead to failed Mac boot. 2 Ways to Verify and Repair Mac Disk Errors

Repair mac hard drive