In the window that opens, select the disk image (it must end in '.dmg') that you will use to restore onto the drive that you just selected to be deleted, then click 'Restore'.

All data will be (irreversibly) deleted from the drive that you select.

Select the empty drive from Step 1 that will be deleted, then click the restore button.

Connect the external drive that will be erased.

You can also create a checksum of the image by clicking on the image, then selecting Images -> Add ChecksumĪpple has another surprisingly helpful knowledgebase article that provides information as well on these steps. Unless you have a compelling reason otherwise, select the option 'read/write'.DVD/CD Master: this image is compatible with 3rd party apps, and will have the extension '.cdr'.read/write: this image will be modifiable, and will have the extension '.dmg'.compressed: this image will be a compressed version of a read-only image.read-only: this image will not be modifiable.Note: If you do not see your disk listed, that means you did not click on it beforehand.Then select select File -> New Image -> Image from 'ExternalHD'.Open Disk Utility, then click on the external hard disk that you wish to clone (for example, 'ExternalHD').The above link has information for previous OSX versions. The steps assume you are using Mac OSX High Sierra or later. This method is fairly straightforward, and Apple has a surprisingly helpful knowledgebase article that provides information as well. Method 2: Use Disk Utility Creating a Disk Image

To restore a disk image, follow the above steps in reverse. If you want to create a disk image on an existing disk, then select a folder instead. If you want to create a cloned copy of the source volume, then select a destination disk, but be advised that existing files may be overwritten. To create a disk image, select the source volume and the destination volume. CCC has been around awhile, and has a simple yet powerful interface that can serve multiple functions, including creating a bootable backup from a disk (like your internal hard disk). If there is a chance of imminent data loss, contact a professional for assistance, and do not rely on a random person from the Internet for help.The following steps have been tested and are a summary of my personal recommendations, but should be used at your own risk.Always make a backup of your data, and make 2 separate backups before trying something new.I have no financial incentives to or Apple.There are three methods that are described: Carbon Copy Cloner, Disk Utility, and CommandLine. This gist details how to create or restore a disk image in Mac OSX.

Hard disk image file restore