Disk Utility will ask if you really wish to perform a restore,.Some versions of Disk Utility may include a box labeled Erase Destination if yours does, make sure the box is checked.Drag the USB flash device's volume name from the device list to the Destination field.The bottom of Disk Utility's device list you may need to scroll down Drag the InstallESD.dmg item from the device list (it will be near.Remember: do not select the volume name select the device Make sure the USB flash device is selected in the device list inĭisk Utility.
Copy the InstallESD.dmg File to the Flash Drive When that process isĬomplete, the flash drive is now ready for use as a bootable device for The USB device will be erased and partitioned. Disk Utility will ask you to confirm that you wish to partition the USB device.Warning: All data on the USB flash drive will be deleted. Make sure that GUID Partition Table is selected from the list of available partition schemes.From the Partition Layout drop-down menu, select 1 Partition.Instead, select the top-level name, which is usually the name of the It mayīe listed with multiple volume names. In the Disk Utility window that opens, scroll through the list ofĭevices in the left-hand pane and select your USB flash device.Insert the USB flash drive into your Mac's USB port.Your Desktop on page 2 of this guide (and a flash drive, of course). When the burn process is complete, eject the DVD, add a label, and store the DVD in a safe location.Ĭreating a bootable copy of Mountain Lion on a USB flash drive isn'tĭifficult all you need is the InstallESD.dmg file that you copied to.A bootable DVD containing OS X Mountain Lion will be created.Place a blank DVD into your Mac's optical drive and click the Burn button again.Select the InstallESD.dmg file you copied to the Desktop in an earlier step.Click the Burn icon, located in the top right corner of the Disk Utility window.Launch Disk Utility, located at /Applications/Utilities.If your Mac is set up to automatically launch aĭVD-related application when you insert a DVD, quit that application. If a notice asks you what to do with the blank DVD, click the.Insert a blank DVD into your Mac's optical drive.Skip this page and go on to the next page. You would rather create a bootable copy on a USB flash drive, you can Previous page), we're ready to burn a bootable DVD of the installer. With Mountain Lion's InstallESD.dmg file copied to the Desktop (see When the process is finished, you'll have a copy of the InstallESD.dmg file that we need to create bootable copies. Pasting the item to the Desktop can take a bit of time, so be patient. Right-click on an empty area of the Desktop and select "Paste Item" from the pop-up menu.Close the Finder window and return to the Desktop.
Make a bootable dvd for mac os x mountain lion install#
Right-click the Install OS X Mountain Lion file and select "Show Package Contents" from the pop-up menu.Scroll through the list of files and locate the one named Install OS X Mountain Lion.Open a Finder window, and navigate to your Applications folder (/Applications).Need to copy it to the Desktop to make creating the bootable image as Install OS X Mountain Lion file we downloaded from the Mac App Store.īecause the image file is contained within the downloaded file, we The Mountain Lion install image that we need to create either theīootable DVD or the bootable USB flash drive is contained within the How do I Create Bootable Copies of the OS X Mountain Lion Installer ?
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