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In older versions of Disk Utility you will see that the Repair Disk option is greyed out. In this case you need to start up your Mac in Recovery Mode and repair the disk from there.
Note if you have a Fusion Drive things are even more complex. However, if you are using Mac OS X Yosemite or earlier, and a file's permissions are no longer set correctly, software that uses the file might not work correctly.
Follow these steps to create a disk image using Disk Utility. There are a number of reasons why you might want to format a drive. Perhaps you want to wipe your startup drive so you can perform a fresh install of OS X, maybe you want to encrypt an external storage drive that you use for work, or you might wish to create a partition for Windows or a different version of the Mac operating system.
Using the Disk Utility in macOS
Repair Disk verifies and, if problems are found, corrects issues with the directory on a disk or volume. The directory is analogous to a combined address book and road map to where data is stored on a disk or volume. A volume , also known as a partition , is section of a physical hard disk which, from the perspective of the operating system, works like a separate disk.
All hard disks have one or more volumes or partitions. While Repair Disk can correct a variety of directory problems, it is generally incapable of repairing severe directory corruption.
Disk Utility - Wikipedia
Before attempting to use a third-party utility to repair a disk or volume, assure that you have the latest version of the utility that is compatible with the version of Mac OS X you are using. Repair Disk Permissions verifies and, if problems are found, resets repairs the permissions on Apple-originated files and folders objects , i. Verification compares the current permissions settings of an Apple-originated object against those specified for that object in its associated installation receipt.
If the permissions of an object differ from those specified in its associated receipt, its permissions are reset to the values specified in the receipt. Where receipts are saved depends on the version of Mac OS X you are using:.
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Never delete files in any of the receipts folders cited above unless specifically instructed to do so by a Mac OS X troubleshoting expert. It is important to understand that Repair Disk Permissions only verifies and repairs the permissions of Apple-originated objects with Apple-originated receipts. This means that Repair Disk Permissions will not correct permissions problems on:. Repair Disk Permissions often produces messages while it is running. These messages are generally of an informational nature and can usually be ignored. Some of these messages may be repeated every time Repair Disk Permissions is run as the receipt for the object in question is forcing the setting of specific permissions, even if no correction is required.
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Again, these can also be ignored.