Command line of Mac OS X. There are alternative solutions, but this command line approach using dd requires This will erase the target volume, replacing whatever data is on the destination drive with the ISO This article left out that the.iso needs to be converted to an.img an apple puts on at the end a. Image via Before You Start The obvious first step here is to. 1 tool for all screws. 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. Basic image editing software for mac. This should make it appear in the Source box on the right.
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