![]() For information about servicing your Mac, see Find out how to service or repair your Mac. If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data. If Disk Utility can’t repair your disk, or you receive a report that the First Aid process failed, try to repair the disk or partition again. If it contains information you need, open it and examine its data to make sure it hasn’t been corrupted. If you can replace a file or re-create it, delete it. Most of the files in the list have aliases in a DamagedFiles folder at the top level of your disk. You need to check each file in the list of affected files. If Disk Utility reports “overlapped extent allocation” errors, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. Otherwise, you may need to do one of the following. You can click Show Details to see more information about the repairs. If Disk Utility reports that the disk appears to be OK or has been repaired, you’re done. ![]() In the sidebar, select the storage device, then click the First Aid button. Repeat steps 6 through 8 for each container on the storage device. In the sidebar, select a container, then click the First Aid button. Repeat steps 2 through 4 for each volume on the storage device. When the First Aid process is complete, click Done. In the First Aid dialog, click Run, then follow the onscreen instructions. In the sidebar, select a volume, then click the First Aid button. If you check your startup volume (Macintosh HD), make sure you also check your data volume (Macintosh HD - Data). I then typed: diskutil unmountDisk force disk0 Followed by error: 'Forced unmount of disk0 failed: at least one volume. You must be booting the computer from the Recovery HD partition, a USB stick with the Recovery. Then go to the Erase Tab and select the new expanded partition then click erase. Then expand the first partition to include the whole drive (bottom right hand corner). Partition failed with the error: Couldn't unmount disk.' I've went into Terminal, and typed: diskutil list. In DU on the partition tab highlight the last partition and click the Minus Sign. Next, select Disk Utility in the macOS Recovery window, then click Continue. When I try to expand the partition to fill in that extra space, and click 'Apply', I get the error: 'Partition failed. See the Apple Support article About macOS Recovery on Intel-based Mac computers. If you have another solution to a partition failed error in Mac OS Disk Utility, share with us in the comments below.Note: If you’re checking your startup disk or startup volume, restart your computer in macOS Recovery. You can also use the ‘fsck_hfs’ command if desired. But, fortunately fsck does work just fine for most situations where ‘partition failed’ error is showing up in Mac OS, so give it a try.ĭo note that “fsck” can take a while to run and complete, depending on the size of the drive. The cause of this remains to be seen, and repairing the disk from Disk Utility itself doesn’t work, even when in Single User Mode or when booting from another drive. I have encountered this error a few times when partitioning the boot drive from OS X Lion, most recently after a clean installation when setting up dual boot for OS X Lion and Mountain Lion. Often users may see this error when attempting to partition a Mac boot drive for dual booting or for some similar purpose.
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