Create boot disk image mac

Things to know before proceeding
  1. Create a disk image using Disk Utility on Mac
  2. How to Create Bootable USB Installer for Mac OSX on Windows 10?
  3. Part 2: How to Burn DMG to USB (Bootable) via DMG Editor on Mac

For this reason, it's a good idea to resize and add a partition dedicated to the new Recovery HD volume you are about to create. The Recovery HD partition can be very small; MB is the minimum size, although we suggest making it slightly larger. Disk Utility probably won't be able to create a partition that small , so just use the smallest size it can create.

Create a disk image using Disk Utility on Mac

Creating the new Recovery HD volume this way doesn't set the visibility flag to hidden. As a result, the Recovery HD volume will appear on your desktop. Here's how.

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If you have multiple Recovery HD volumes attached to your Mac, you can select the one to use in an emergency by starting your Mac with the option key held down. This will force your Mac to display all available bootable drives. You can then pick the one you want to use for emergencies. Since Disk Utility can no longer access the hidden Recovery HD partition, we have to use a different method, specifically, Terminal and the command line version of Disk Utility, diskutil. Our first step is to create a disk image of the hidden Recovery HD.

The disk image does two things for us; it creates a copy of the hidden Recovery HD volume, and it makes it visible, easily accessible from Mac's desktop.

How to Create Bootable USB Installer for Mac OSX on Windows 10?

We need to find the disk identifier for the hidden Recovery HD partition. Enter the following at the Terminal prompt:. Terminal will display a list of all partitions your Mac is able to access, including those that are hidden. The line with the Recovery HD item will also have a field labeled Identifier. Here you'll find the actual name used by the system to access the partition. It will likely read something like:. The identifier for your Recovery HD partition may be different, but it will include the word "disk", a number, the letter "s", and another number.

Once you know the identifier for the Recovery HD, we can proceed to make the visible disk image. The next step is to partition the drive that you wish to have the Recovery HD volume created on. However, since the size can change with each new version of the operating system, we suggest making the partition size larger than 1. The next-to-last step is to clone the Recovery HD disk image to the partition you just created.

You can do this in the Disk Utility app using the Restore command. If you remember back to when we started this process, we asked you to use Terminal's "diskutil" to find the Recovery HD volume.

Part 2: How to Burn DMG to USB (Bootable) via DMG Editor on Mac

So, our last task is to set the Type. This will also cause the Recovery HD volume to become hidden. We need to discover the disk identifier for the Recovery HD volume you just created.

Use the 'createinstallmedia' command in Terminal

Because this volume is currently mounted on your Mac, we can use Disk Utility to find the identifier. Share Pin Email. Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. He is the president of Coyote Moon, Inc. You can do the same process in reverse if you need to copy the files back over, or restore the backup should your computer decide to break. Comments 0. The Best Tech Newsletter Anywhere. Join , subscribers and get a daily digest of news, comics, trivia, reviews, and more. Windows Mac iPhone Android.

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Smarthome Office Security Linux. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Create a disk image for recovery Ask Question. Asked 2 years, 3 months ago. Active 9 months ago. Viewed 7k times. The options are greyed out in the above screenshots as I am not booted to Recovery.

You omitted mentioning anything about an external drive. Does that mean that the "Recovery" cannot be placed on an external flash drive?

If you have no backup regime in place, look into macOS's native Time Machine backup software. Of course, in addition to Apple's option, there are many 3rd party products that also do a great job of backing up your data.