For those unfamiliar with data formats, there are several popular options: If your external drive appears when plugged into a PC but not your Mac, chances are that the drive’s formatting isn’t compatible with macOS. Or obtain a more comprehensive disk repair program.Once repaired, you should be able to access your external drive as normal.
To repair this damage, you can either back up your disk and reformat, This indicates that some of your files may be more severely damaged. Problems were found, but Disk First Aid cannot repair Occasionally, at the end of a scan, a message similar to the following Handling problems First Aid cannot repair First Aid will warn you if one of these conditions exists when Write-protected disk such as a DVD-ROM, or a disk that has openįiles). (e.g., the startup disk, the volume where Disk Utility resides, a Note: Some volumes can be verified but not repaired Run First Aid repeatedly until you see theįollowing message at the end of the scan, where diskname The results of a verification and/or repair will be posted in the To verify and repair any problems on the selected volume(s), click Repair Disk.
To begin a verification process (a simple check for errors), click. 
Select multiple volumes by holding down the
In the column on the left, select the volume you want to repair,Īnd then on the right, click the First Aid tab. Later) or Disk Utilities (Mac OS X 10.4) menu, select Follow the instructions on the screen, and when the menu barĪppears, from the Utilities ( Mac OS X 10.5 and. To force yourĬomputer to boot from the DVD, hold down the Insert the DVD, and then restart your computer. To check your startup disk, run First Aid from your software Rather than file system errors, see ARCHIVED: Using Mac OS X, how do I repair permissions, and what does that do? Note: For help with correcting permissions problems Problems from developing into bigger ones. This preventive maintenance can help keep small Use other utility programs or repair methods.Įven if you are not getting errors, it is a good idea to run First Aid However, your volume has suffered severe corruption, you may need to Messages, or exhibiting unusual behavior, you can use First Aid as aįirst step to check for defects and, in many cases, repair them. If your computer is crashing frequently, displaying cryptic error Handling problems First Aid cannot repair. Within the Disk Utility program, First Aid is a functionįor checking and repairing file system errors. Information here may no longer be accurate, and links may no longer be available or reliable. This content has been archived, and is no longer maintained by Indiana University.
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