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If you fall into this situation, make sure this box is selected.ħ.

Some versions of Disk Utility may include a box labeled Erase Destination. Drag the volume name of the USB device from the device list to the Destination field. You may need to scroll down to find it.Ĥ. It will be near the bottom of Disk Utility's device list. Drag the InstallESD.dmg item from the device list into the Source field. Do not select the volume name but select the device nameģ. Make sure the USB device is selected in the device list in Disk Utility. Copy the InstallESD.dmg file to the flash driveġ. When that process is complete, the flash drive is ready for you to copy the InstallESD.dmg file. Disk Utility requires you to confirm that you want to partition the USB device. Make sure that the GUID Partition Table is selected from the list of available partition schemes. From the Partition Layout drop-down menu, select 1 Partition. Instead, choose the top-level name, usually the device's name, such as 16GB SanDisk Ultra. It can be listed with multiple volume names. In the Disk Utility window open, scroll through the list of devices in the left panel and select your USB device. Launch Disk Utility, located in / Applications / Utilities.ģ. Insert the USB into the USB port of the Mac.Ģ. All you need is the InstallESD.dmg file that you copied to the desktop and flash drive. Create a bootable copy of Mountain Lion on a hard drive. If you can't burn DVDs, you can use a bootable USB drive. When the burn is complete, remove the DVD, add the label and store the DVD in a safe location.Ĭopy the installer Lion X Mountain Lion to the USB can boot Put a blank DVD in the Mac's optical drive and click the Burn button again to create a bootable DVD containing OS X Mountain Lion.Ĩ. Select the InstallESD.dmg file you copied to the desktop.ħ. Click the Burn icon, located in the top right corner of the Disk Utility window.ĥ. Launch Disk Utility, located in / Applications / Utilities.Ĥ.

Os x lion installer mac#

If the Mac is set to automatically launch an application related to DVD, when you insert the DVD, exit the application.ģ. If a message asks you what to do with the blank DVD, click the Ignore button. Insert a blank DVD disc into the Mac's optical drive.Ģ. With the Mountain Lion InstallESD.dmg file copied to the desktop, you're ready to burn the installer bootable DVD.ġ. Burn the bootable DVD of the Lion X Mountain Lion installer When the process is finished, you have a copy of the InstallESD.dmg file that you need to create a bootable copy on the desktop. Pasting an item into the desktop takes some time, so be patient. Right-click an empty area on the desktop and select Paste Item from the pop-up menu. Close the Finder window and return to the desktop.ħ. Right-click the InstallESD.dmg file and select Copy InstallESD.dmg from the pop-up menu.Ħ. You will see a file called InstallESD.dmg.ĥ. Open the Contents folder and then open the SharedSupport folder.

Os x lion installer install#

Right-click the Install OS X Mountain Lion file and select Show Package Contents from the pop-up menu.Ĥ. Scroll through the list of files and find the file called Install OS X Mountain Lion. Open the Finder window and go to the Applications folder (/ Applications).Ģ. The installation of Mountain Lion that you need to create a bootable DVD or USB drive is contained in the Install OS X Mountain Lion file that you downloaded from the Mac App Store.īecause the image is contained in the downloaded file, copy it to the desktop to create an image that can be booted as easily as possible.ġ. Locate the installation of Mountain Lion image You must create a bootable copy of the installer before you install Mountain Lion, because the setup process will delete the files you need to create a bootable copy of the installer. This file is called Install OS X Mountain Lion. It is saved in the Applications folder on the Mac.

Os x lion installer download#

You can also use a USB flash drive with at least 5GB capacity (8GB and 16GB are available sizes) as a bootable medium.ĭownload a copy of OS X Mountain Lion that you must purchase at Apple Store online and download it from the Mac App Store. If your Mac doesn't have an integrated SuperDrive, use an external DVD burning tool. DVD dual layer is available wherever standard DVDs are sold. The OS X Mountain Lion installer is just too big a thing to match the standard DVD. DVD dual layer has two layers, increasing the available recording space to about 8.5GB. You need a dual layer DVD (DVD with double sided recording) and a disc or USB drive.

Copy the InstallESD.dmg file to the flash drive.

Copy the installer Lion X Mountain Lion to the USB can boot.

Burn the bootable DVD of the Lion X Mountain Lion installer.

Locate the installation of Mountain Lion image.

Os x lion installer how to#

How to create OS X Mountain Lion installer on DVD or USB