![]() ![]() ![]() Erasing the disk in the drive level reformats the area where the partition map and the directory are written, wiping the damaged or faulty partition map. If the drive can't be mounted, the best solution is to reformat it with a clean, new file system. This should also show the drive on your desktop if done successfully. If the external hard drive is grayed out in Disk Utility, you can manually mount it by clicking the Mount button in the menu bar. Here are the solutions to try if Disk Utility reports "Problems were found with the partition map" on external hard drives. It might also occur if the external hard drive was not ejected properly. The partition map can become corrupt or damaged from an error in writing to the drive when creating or deleting partitions or from a media error where a bit of data on that particular sector or block has become corrupt. How to fix 'Problems were found with the partition map' on external hard drives? Fsck, which is shortened for "File System Consistency Check," is a command-line tool that verifies and repairs the underlying structure of a hard drive. Suppose the repair in Disk Utility failed with errors like " Partition map check failed because no slices were found." In this case, you can run fsck in Single User Mode to fix the drive. Solution 2: Fix the drive using fsck in Single User Mode If Disk Utility reports no error on the internal volumes and your Mac boots up fine, you shouldn't worry too much about it. If the issue persists, run First Aid for the volumes under the disk one by one and check if they have issues. Select your startup disk (the one at the top) and click "First Aid.".Click Disk Utility > Continue from the pop-up menu.On M1 & M2 Macs: Shut down your Mac, press and hold the power button until getting to the "Loading startup options" screen, then click Options > Continue. On Intel Macs: Restart your Mac, then immediately press and hold Command + R until seeing the startup screen. If you're receiving "Problems were found with the partition map" on an unbootable Mac: iBoysoft Data Recovery also allows you to free preview files before recovery. It's compatible with Intel, T2, and Apple Silicon Macs running on Mac OS X 10.11 ~ macOS 13 Ventura. It's designed with usability and capability in mind, able to restore over 1000 file formats, including photos, videos, documents, audio files, emails, archives, etc., from an unbootable Mac and inaccessible, unmountable, or corrupted external hard drives, USB flash drives, SD cards, and other common storage devices. To retrieve data from an inaccessible or unbootable internal or external hard drive, you should employ the professional data recovery tool: iBoysoft Data Recovery for Mac. So, the utmost important thing now is to recover your lost data from the inaccessible drive. Often, the most effective way to fix the "Problems were found with the partition map" error, regardless of whether it happens on the internal or external hard drive, is to reformat the disk, which will erase all your data. If the error occurs on your external hard drive, you likely find the external hard drive grayed out in Disk Utility and isn't accessible from your desktop or Finder. Mac boots to a folder with a question mark.When experiencing " Problems were found with the partition map" on Mac's startup disk, your Mac may have issues booting up, such as: ![]() How to recover data when seeing 'Problems were found with the partition map'? FAQ about 'Problems were found with the partition map' How to fix 'Problems were found with the partition map' on internal hard drives? How to recover data when having 'Problems were found with the partition map'? Guide to " Problems were found with the partition map which might prevent booting" : You can recover the lost data following the next section if the drive is inaccessible. It's important that you back up your data before carrying on with the solutions if you still can access the drive. Partition map check failed because no slices were found.Error: -69660: The partition map needs to be repaired because it is too large for its container disk.The partition map needs to be repaired because there's a problem with the EFI system partition's file system. ![]()
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