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Disk Utility User Guide
You can use Disk Utility to create a disk image, which is a file that contains other files and folders.
Note: You can burn information to a CD or DVD using the Burn command in the Finder. See Burn CDs and DVDs.
Create a blank disk image for storage
You can create an empty disk image, add data to it, then use it to create disks, CDs, or DVDs.
- 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.
- In the Name field, enter the name for the disk image.This is the name that appears on your desktop and in the Finder sidebar, after you open the disk image.
- In the Size field, enter a size for the disk image.
- Click the Format pop-up menu, then choose the format for the disk:
- If the disk image will be used with a Mac that has a solid state drive (SSD) and uses macOS 10.13 or later, choose APFS or APFS (Case-sensitive).
- If the disk image will be used with a Mac with macOS 10.12 or earlier, choose Mac OS Extended (Journaled) or Mac OS Extended (Case-sensitive, Journaled).
- If the disk image will be used with a Mac or Windows computer and is 32 GB or less, choose MS-DOS (FAT); if it’s over 32 GB, choose ExFAT.
- To encrypt the disk image, click the Encryption pop-up menu, then choose an encryption option.
- Click the Partitions pop-up menu, then choose a partition layout.
- Click the Image Format pop-up menu, then choose an option:
- Sparse bundle disk image: Same as a sparse disk image (below), but the directory data for the image is stored differently. Uses the .sparsebundle file extension.
- Sparse disk image: Creates an expandable file that shrinks and grows as needed. No additional space is used. Uses the .sparseimage file extension.
- Read/write disk image: Allows you to add files to the disk image after it’s created. Uses the .dmg file extension.
- DVD/CD master: Changes the size of the image to 177 MB (CD 8 cm). Uses the .cdr file extension.
- Click Save, then click Done.Disk Utility creates the disk image file where you saved it in the Finder and mounts its disk icon on your desktop and in the Finder sidebar.
- In the Finder, copy your files to the mounted disk image, then eject it.
- Restore the disk image to a disk.For more information about disk image types, see the manual (man) page for hdiutil.
Create a disk image from a disk or connected device
You can create a disk image that includes the data and free space on a physical disk or connected device, such as a USB device. For example, if a USB device or volume is 80 GB with 10 GB of data, the disk image will be 80 GB in size and include data and free space. You can then restore that disk image to another volume.
- In the Disk Utility app on your Mac, select a disk, volume, or connected device in the sidebar.
- Choose File > New Image, then choose “Image from [device name].”
- 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.
- Click the Format pop-up menu, then choose an option:
- Read-only: The disk image can’t be written to, and is quicker to create and open.
- Compressed: Compresses data, so the disk image is smaller than the original data. The disk image is read-only.
- Read/write: Allows you to add files to the disk image after it’s created.
- DVD/CD master: Can be used with third-party apps. It includes a copy of all sectors of the disk image, whether they’re used or not. When you use a master disk image to create other DVDs or CDs, all data is copied exactly.
- To encrypt the disk image, click the Encryption pop-up menu, then choose an encryption option.
- Click Save, then click Done.Disk Utility creates the disk image file where you saved it in the Finder and mounts its disk icon on your desktop and in the Finder sidebar.
Important: Don’t create a disk image of a disk that you believe to be failing or that contains corrupted information. The disk image may not serve as a reliable backup.
For technical information about creating a restore disk image, see the Apple Software Restore (ASR) manual (man) page.
Create a disk image from a folder or connected device
You can create a disk image that contains the contents of a folder or connected device, such as a USB device. This method doesn’t copy a device’s free space to the disk image. For example, if a USB device or volume is 80 GB with 10 GB of data, the disk image will be 10 GB in size and include only data, not free space. You can then restore that disk image to another volume.
- In the Disk Utility app on your Mac, choose File > New Image, then choose Image from Folder.
- Select the folder or connected device in the dialog that appears, then click Open.
- 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.
- To encrypt the disk image, click the Encryption pop-up menu, then choose an encryption option.
- Click the Image Format pop-up menu, then choose an option:
- Read-only: The disk image can’t be written to, and is quicker to create and open.
- Compressed: Compresses data, so the disk image is smaller than the original data. The disk image is read-only.
- Read/write: Allows you to add files to the disk image after it’s created.
- DVD/CD master: Can be used with third-party apps. It includes a copy of all sectors of the disk image, whether they’re used or not. When you use a master disk image to create other DVDs or CDs, all data is copied exactly.
- Hybrid image (HFS+/ISO/UDF): This disk image is a combination of disk image formats and can be used with different file system standards, such as HFS, ISO, and UDF.
- Click Save, then click Done.Disk Utility creates the disk image file where you saved it in the Finder and mounts its disk icon on your desktop and in the Finder sidebar.
For technical information about creating a restore disk image, see the Apple Software Restore (ASR) manual (man) page.
Create a secure disk image
If you have confidential documents that you don’t want others to see without your permission, you can put them in an encrypted disk image.
Note: If you want to protect the contents of the system disk, turn on FileVault using the FileVault pane of Security & Privacy Preferences.
- 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.
- In the Name field, enter the name for the disk image.This is the name that appears on your desktop and in the Finder sidebar, after you open the disk image.
- In the Size field, enter a size for the disk image.
- Click the Format pop-up menu, then choose a format:
- If you’re using the encrypted disk image with a Mac computer using macOS 10.13 or later, choose APFS or APFS (Case-sensitive).
- If you’re using the encrypted disk image with a Mac computer using macOS 10.12 or earlier, choose Mac OS Extended (Journaled) or Mac OS Extended (Case-sensitive, Journaled).
- Click the Encryption pop-up menu, then choose an encryption option.
- Enter and re-enter a password to unlock the disk image, then click Choose.WARNING: If you forget this password, you won’t be able to open the disk image and view any of the files.
- Use the default settings for the rest of the options:
- Click the Partitions pop-up menu, then choose Single partition - GUID Partition Map.
- Click the Image Format pop-up menu, then choose “read/write” disk image.
- Click Save, then click Done.Disk Utility creates the disk image file where you saved it in the Finder and mounts its disk icon on your desktop and in the Finder sidebar.
- In the Finder , copy the documents you want to protect to the disk image.
- If you want to erase the original documents so they can’t be recovered, drag them to the Trash, then choose Finder > Empty Trash.
When you’re finished using the documents on the secure disk image, be sure to eject the disk image. As long as it’s available on your desktop, anyone with access to your computer can use the documents on it.
To access the data in a disk image, double-click it. It appears on your desktop, and you can add, remove, and edit files on it just as you would with a disk.
See alsoAdd a checksum to a disk image using Disk Utility on MacVerify that a disk image’s data isn’t corrupted using Disk Utility on MacRestore a disk image to a disk using Disk Utility on MacConvert a disk image to another format using Disk Utility on Mac
Sep 27, 2020 • Filed to: Solve Mac Problems • Proven solutions
Apple claims that its Mac OS is fully equipped to assist its users for day-to-day PC activities, and they seem to have proven the same over the years. Since Mac users save a lot of important data on it, it is necessary to keep all such information secure. Mac Disk Utility does exactly that with the help of its 'Restore' option. This function teaches you how to Clone a Mac's Drive with Disk Utility.
In this article, learn how to copy all the data and clone a Mac's Drive (internal/external) easily. Read and know more about Mac Disk Utility, its 'Restore' function, how to clone a Mac's Drive with Disk Utility, and a simple way torecover your Mac's Drive.
Part 1: Why You Need to Clone a Mac's Drive?
'What is the need to clone a Mac's Drive?' This thought must have crossed your mind atlas once while using Mac. To be precise, cloning of hard drives protects your important data which is under possible risk of physical destruction, loss, etc.
No matter how new or of what quality your hard drive is, you cannot say for sure that it will last forever and never crash or suffer from a system failure. Old hard drive or one suffering from mechanical, firmware, or electrical error can permanently destroy your data, such as photos, documents, videos, music, and other files. Also, if important personal documents and business files are misplaced in the process, retrieving them is next to impossible.
Therefore, to prevent these and many more situations that may arise due to data loss, we recommend that you always know how to Clone a Mac's Drive using Disk Utility. Mac Disk Utility and its 'Restore' functions can keep your data, important information, and files secure by literally copying it from your Mac Drive.
Difference Between Time Machine Backup and Cloning Hard Drive
If you're wondering whether to use Time Machine or Mac Disk Utility to clone a Mac's Drive, let us clear the confusion for you. Time Machine is a built-in application to back up and make an up-to-date copy of the data you save on the Mac. Its unique feature is that it makes real-time backups to recover files easily whenever needed. When set-up for the first time, Time Machine performs a full backup of the Mac and its contents. Time Machine keeps, hourly, daily and monthly backups all categorized separately.
If Time Machine can do so much, then why consider using Mac Disk Utility?
To start the discussion, Mac Disk Utility is free and also comes built-in with every Mac OS version. It has various new features that make it more suitable than the Time Machine. Say, for example, its 'Restore' option does something what is called block copy and make the entire cloning process swifter. It is also capable of making an almost cut to cut an exact copy of the contents of the Drive. No important files, documents, or data are left behind using Mac Disk Utility. It works in blocks and does not involve file to file transfer.
Some changes have been introduced in the Mac Disk Utility toolkit which makes more accurate cloning and copying data from the Drive.
Part 2: How to Clone Mac's Drive using Disk Utility?
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Curious to know how to clone a Mac's Drive with Disk Utility? Follow these simple steps and you're good to go:
Related: If need be, learn how touse Disk Utility to resize Mac volume.
- Open Mac Disk Utility on your Mac from Utilities or Applications.
- Click 'Erase' from the top of the Disk Utility interface.
- Now chose a media on the left panel to make it your backup drive.
- At the drop-down list which has 'Format' options, choose Mac OS Extended (Journaled). Then hit 'Erase' again and wait for the drive to remount on Mac.
- Then at the Mac Disk Utility interface, click 'Restore'.
- Now comes the tricky bit. Select the target drive, drag it and drop it at the 'Source' field.
- Now drag and drop the destination Disk/Drive and leave it at the 'Destination' field.
- Hit 'Restore' once and for all. The contents of the drive will be copied and saved on the destination drive.
Part 3: How to Recover Mac's Drive Data?
What does one do if some data is lost during cloning the mac's Drive? Don't worry. The loss isn't permanent and the destroyed data can be recovered with the help ofRecoverit for Mac. It is a recovery tool for MacBook, iMac, Hard Drives, Flash Drives, Memory Cards, phones, cameras, and camcorders. It can instantly retrieve the lost contents from the Mac Drive and provide reliable data recovery solutions. It can recover documents, images, videos, audio files, emails and archives files.
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The steps given below will help you use Recoverit for Mac to recover Mac's Drive:
- Download, install and launch Recoverit hard drive recovery software. Now choose the target drive where the data gets lost, and click 'Start' to recover lost data.
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- And then the data recovery tool will set in motion an all-around scan to search the lost files.
- Finally, you can preview the whole scanned results, select the ones which need to be restored, click 'Recover' as shown below, and save the recovered data in another drive/disk to keep it secure for future.
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Conclusion
The bottom line, we have attempted to answer a commonly asked question on online forums, i.e., how to clone a Mac's Drive with Disk Utility. We hope you will find this red useful and now be able to clone your Mac's drive and keeps its contents safe.
Also, the Recoverit drive data recovery toolkit is a safe, effective, and trustworthy medium to retrieve your lost documents and file. So go ahead and follow the instructions in this guide to clone Mac's drive orrecover hard drive datadeleted accidentally during its process.
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