Verify and Repair Disk Permissions via Terminal (Mac OS X)

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In the Disk Utility app on your Mac, choose File New Image Blank Image. Enter a filename for the disk image, add tags if necessary, then choose where to save it. This is the name that appears in the Finder, where you save the disk image file before opening it. Disk Utility is an application that's built into OS X that can perform lots of useful and even scary actions. Experienced users find frequent need of this handy tool but those newer to the Mac. Deleting the Windows EFI Boot Entry. The Mac Observer's Videos. By creating the partition o Disk Utility and then formatting it using the windows install partition creator.

Verify Permissions

diskutil verifyPermissions /

Repair Permissions

diskutil repairPermissions /

Verify and Repair Volume via Terminal (Mac OS X)

Launch Terminal from your Dock, Utilities folder, or via an app launcher like Alfred. Once launched, type or paste in the following command.

diskutil verifyVolume [drive name]

So, for your main hard drive, you could type or paste in something like:

diskutil verifyVolume /

Or, if you have an external drive attached, you can type or paste in the following:

diskutil verifyvolume /Volumes/[drive name]/

So for an external drive named “BackupStuff” you would enter:

diskutil verifyvolume /Volumes/BackupStuff/

If you see no messages, then you can assume that diskutil hasn’t found any errors, and you can move on. Mac task code et105an manual. If, however, you get an error like “The volume Macintosh HD was found corrupt and needs to be repaired,” then you can repair the drive using diskutil as well.

To repair the drive, you can issue the following command into Terminal:

diskutil repairvolume /

Or, for that external drive as above:

diskutil repairvolume /Volumes/BackupStuff/

Beta versions of macOS High Sierra made a change in the disk format of systems by converting them to use the new Apple File System. The initial release of macOS High Sierra will provide support for the new Apple File System as the default boot filesystem on Mac systems with all-Flash built-in storage. If you installed a beta version of macOS High Sierra, the Fusion Drive in your Mac may have been converted to Apple File System. Because this configuration is not supported in the initial release of macOS High Sierra, we recommend that you follow the steps below to revert back to the previous disk format.

BACK UP YOUR DATA.

These steps include destructive operations that will delete all data contained on the Apple File System Fusion Drive. Please back up your data with Time Machine or another backup solution before proceeding.

Using the macOS High Sierra Installer (requires dedicated external drive of 10GB or greater)

Create a bootable installer on external drive using createInstallMedia.

Full steps at https://support.apple.com/HT201372

sudo /Volumes/InstallAssistant/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/<external drive>

where <external drive> is the name of the drive where you wish to create a bootable installer.

Note: createInstallMedia will erase the selected volume.

Choose the macOS High Sierra installer as your startup disk.

Ensure your external drive from step 3 is plugged into your Mac.

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Hold down the Option key immediately after turning on or restarting your Mac.

Release the Option key when you see the Startup Manager window.

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Select the Install macOS High Sierra boot volume, then click the arrow or press Return.

Using Internet Recovery (Recommended for advanced users only. Requires a Mac running 10.12.5 or later)

Start the Fusion Drive-equipped Mac using Internet Recovery

Hold Option + Command + R keys after powering on the Mac. You should see a spinning globe indicating that Internet Recovery has started.

Use the diskutil command to determine which internal disks are a part of the Apple File System Fusion Drive.

diskutil list internal should show output like:

$ diskutil list internal
/dev/disk0 (internal):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme 121.3 GB disk0
1: EFI EFI 314.6 MB disk0s1
2: Apple_APFS Container disk2 120.9 GB disk0s2
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *4.0 TB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_APFS Container disk2 4.0 TB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3
4: Apple_KernelCoreDump 1.1 GB disk1s4
/dev/disk2 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +4.1 TB disk2
Physical Stores disk0s2, disk1s2
1: APFS Volume APFS_Fusion_Volume 280.5 GB disk2s1
2: APFS Volume Preboot 22.0 MB disk2s2
3: APFS Volume Recovery 527.9 MB disk2s3
4: APFS Volume VM 2.1 GB disk2s4

Note: the physical disks that comprise the Apple File System Fusion Drive are disk0 and disk1 in this example

Unmount the Apple File System Fusion Drive:

diskutil unmount force disk2s1

OR

diskutil unmount force /Volumes/APFS_Fusion_Volume

Erase each of the physical disks identified in step 4

diskutil eraseDisk JHFS+ SSD disk0

diskutil eraseDisk JHFS+ HDD disk1

Mac Diskutil Mount

Create a CoreStorage Fusion Group

diskutil cs create 'Macintosh HD' disk0 disk1

Create a CoreStorage Fusion volume

diskutil cs createVolume 'Macintosh HD' JHFS+ 'Macintosh HD' 100%

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