Disk Utility User Guide

If Disk Utility isn’t open, click the Launchpad icon in the Dock, type Disk Utility in the Search field, then click the Disk Utility icon. 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.

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You can restore a disk image to a disk. To do this, you first need to erase the disk. If the disk image has multiple partitions, you must restore each partition individually.

Restore a disk image with a single volume to a disk

1. In the Disk Utility app on your Mac, select the volume that you want to restore in the sidebar, then click the Restore button .

   This is the volume that is erased and becomes the exact copy.

2. Click the Restore pop-up menu, then choose the volume you want to copy.

   If you’re restoring from a disk image, click the Image button, then navigate to that disk image.

3. Click Restore.

• Disk Utility is Apple's go-to macOS app for finding and repairing common disk errors, but if it's your Mac's internal disk that's the problem, then your Mac might not even start up into macOS.
• When your hard drive starts to fail, Disk Utility offers some useful disk repair tools. But if they don’t get it done for you, you might want to turn to one of the big guns: fsck. Fsck, which stands for “File System Consistency Check,” is a command-line tool that reviews and repairs the underlying structure of a hard drive.

Restore a disk image with multiple volumes to a disk

To restore a disk image with multiple volumes to a disk, you must partition the destination disk, then restore each volume individually.

1. In the Finder on your Mac, double-click the disk image to open it.

   The disk image’s volumes appear as disks in the Finder.

2. In the Disk Utility app, select the disk in the sidebar, click the Partition button , then partition the destination disk.

   The destination disk must have as many partitions as the disk image, and each of the disk’s partitions must be at least as large as the corresponding partition in the disk image. See Partition a physical disk in Disk Utility on Mac.

3. In the sidebar, select the volume that you want to restore, then click the Restore button .

   This is the volume that is erased and becomes the exact copy.

4. Do one of the following:

   • Restore from a volume: Click the “Restore from” pop-up menu, then choose the volume you want to copy.

   • Restore from a disk image: Click Image, choose the disk image you want to copy, then click Open.

5. Click Restore.

6. Repeat steps 3–5 for each remaining partition.

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