Download the ISO CD image to a folder on your computer. Click to highlight the file (Windows 7/Vista) and/or right-click on the file (Windows 7 only) to see the.

Image via Before You Start The obvious first step here is to. But before you do anything else, a word of caution: once you've used the OS X installer, it will automatically delete the file you need to make the backup disk, so you'll want to either make a copy of the installer or create your disk before you upgrade.

You can use a USB flash drive, external hard drive, or DVD-R disc, but the USB drive is quicker. If you're using a USB drive, it has to be formatted as 'Mac OS Extended (Journaled)' and set to partition type 'GUID Partition Table' in order to work. Image via Once inside, browse to the ' Contents > SharedSupport' folder where there will be a file called ' InstallESD.dmg.' This is the image file that contains the information you need to create the backup disk.

Step 2: Open Disk Utility (located in your Applications > Utilities folder). Step 3: Drag and drop the ' InstallESD.dmg' into the list of drives on the left and select it. This should make it appear in the Source box on the right. If not, you may have to click the ' Restore' tab as seen below.

Advertisement Here’s the dilemma. You’re a Mac user who has to create a clone of a disc to be shared with friends. However, the disk must be compatible with Windows. Perhaps surprisingly, you can create a Windows-compatible ISO disc image through macOS without using any Wondering where all of your Mac's storage has gone? These free apps will let you know. All you need is your Mac’s Disk Utility and some magic from Terminal. Here are the simple steps.

Create an Image with Disk Utility Note: If you already have a.CDR image, you can skip straight to the next step. Connect an external drive (or, if you have an older Mac, i nsert a disc into the CD/DVD drive) to your Mac and launch Disk Utility, which Want to dictate notes, look up words, and merge PDFs? Your Mac has in-built tools for these tasks and more!, from the Utilities folder.

Your disk will appear in the left column window. Click on it once to highlight, as shown in the screenshot below.

Now that you’ve selected the source of the disc image, click on File > New > Disk Image from In the popup window, select Desktop as your destination. Next, make sure to choose DVD/CD Master as the Image Format. Choosing this format ensures the contents of the disk are copied entirely as a.CDR image. You should keep the image’s name short so that it’s easily reproduced. If asked, enter your Mac password and hit OK to begin the disk image process. Depending on how large the disc is, the amount of time that’s necessary varies. You’ll see a progress bar estimating the time until completion.

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Once the process finishes, hit “Done,” and check your Desktop for the.CDR image. In its current state, the disk is ready for use on any Mac. To share the file with Windows users, you’ll need to convert it into a recognizable format. To do this, you’ll use your Mac’s You can only cram so much into graphical user interface before it becomes cluttered, so it should come as no big surprise that you can do some really cool things using the Mac Terminal. As you can tell from the screenshot above, Terminal will create a new hybrid image.