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By default, a Mac runs a different file system, so it may bring issues while partitioning your disk on Disk Utility. Hard drive partitioning is a common issue discussed in many tech forums. In a thread on Apple’s support forum, users complain that their Mac Disk Utility partition grayed-out while trying to partition their external hard drives. Feb 08, 2012 While you’re in Recovery mode, you may also want to verify disk permissions and repair them, repair user permissions, and verify and repair other disks as well. Again, if you see that the “Repair Disk” function is greyed out and not clickable in Disk Utility, be sure to boot back into Recovery Mode again on the Mac to make it accessible.
Disk Utility User Guide
You can use Disk Utility on your Mac to manage internal disks and external storage devices. Using Disk Utility, you can:
Format and manage volumes on physical storage devices.
Create a disk image, a single file you can use to move files from one computer to another or to back up and archive your work.
Combine multiple hard disks into a RAID set that acts as a single disk. Using multiple hard disks in a RAID set can increase the performance, reliability, and storage capacity of your data storage system, depending on the type of set you choose.
Check for and repair errors on your disks and volumes.
Disk Utility User Guide
You can restore a volume from another volume. When you restore from one volume to another volume, an exact copy of the original is created.
WARNING: When you restore one volume to another, all the files on the destination volume are erased. Before you restore a volume, copy any files on the destination volume that you want to save to a different volume.
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In the Disk Utility app on your Mac, choose View > Show All Devices.
In the sidebar, select the volume you want to restore, then click the Restore button .
This is the volume that is erased and becomes the exact copy.
Click the Restore pop-up menu, then choose the volume you want to copy.
Click Restore, then click Done.
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You can also use Disk Utility in macOS Recovery to restore a volume. See the Apple Support article About macOS Recovery.