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DISK UTILITY FOR MAC REPAIR DISK USING HOW TO

Select Disk Utility and click Continue.

When your Mac restarts, press Command + R and hold the keys until the Apple logo appears.

Click on the Apple menu (top left corner), choose Restart.

You’ll lose access to it after you restart your Mac later.

Print this article or open it on any other device.

If it fails, the only alternative is backing up your data and getting a new disk. That’s only possible if your disk can be saved by means of Mac’s native app, Disk Utility.

DISK UTILITY FOR MAC REPAIR DISK USING HOW TO

Using the backup partition table or Disk Warrior won't work if the drive is failing or you have a bad hard drive cable.We’ll go over how to perform hard disk repair on Mac using software solutions. If the drive is healthy and the drive was using the HFS+ file system (aka MacOS Extended Journaled), then you could try using the paid utility Disk Warrior to try and fix the partition table. You should also assess the health of the hard drive before doing trying this option. But beware this could make things worse where you could lose access to the data if you don't have a backup. If the drive is healthy, then you could attempt to restore the partition table on the drive with a backup copy, but this requires the use of the Terminal app and the command line. Within the GSmartControl app double-click on the laptop's drive icon to access the drive's health report. Once at the Knoppix desktop click on the "Start" menu button in the lower left corner of the Taskbar and navigate the menus to "System Tools -> GSmartControl". While Knoppix is booting the laptop may appear to be frozen on the Apple boot picker menu so give Knoppix lots of time to finish booting. Option Boot the Knoppix USB drive and select the orange icon labeled "EFI". You don't need to know anything about Linux to do this if you follow these instructions. If you don't have an external macOS boot drive, then you can create a Knoppix LInux USB boot drive using Etcher (Mac/Windows/Linux). Post the report here using the "Additional Text" icon which looks like a piece of paper. If you have an external macOS boot drive you can check the health of the hard drive using DriveDx. The Apple Diagnostics will only be able detect the more severe drive failures.

You can try removing the hard drive and connect it externally with a USB to SATA Adapter, drive dock, or enclosure. This cable has an extremely high rate of failure on the 13" non-Retina model. If you have the 13" non-Retina model, then perhaps the hard drive SATA cable is defective. If Catalina's Disk Utility is unable to repair the partition map, then the best thing to do is erase the entire physical drive and reinstall macOS or restore from a backup. An older version of macOS may not be able to repair a drive which was formatted with a newer version of Disk Utility. Run First Aid again to see if this version of Disk Utility can repair the partition table. Try booting into Internet Recovery Mode using Command + Option + R so that it boots to macOS 10.15 Catalina so that you have the most recent version of Disk Utility. Try running the Apple Diagnostics to see if the hard drive may be starting to fail.