Apr 26, 2021 A bootable installer for OS X El Capitan is a good idea, even if your plan is to perform an upgrade install. Having your own copy of El Capitan on a separate device ensures that you'll always be able to install or reinstall the OS X. Nov 14, 2019 In order to create a bootable copy of the OS X Mavericks installer, you must locate the InstallESD.dmg file that's hidden in the OS X Mavericks installer you downloaded from the Mac App Store. This image file contains a bootable system and the files necessary to install OS X Mavericks.
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| http://subrosasoft.com/blog/2011/07/create-a-bootable-mac-os-x-10-7-lion-flash-drive/ |
| 1) Purchase and download Lion from the Mac App Store on any Lion compatible Mac running Snow Leopard. |
| 2) Right click on “Mac OS X Lion” installer and choose the option to “Show Package Contents” |
| 3) Inside the Contents folder, you will find a SharedSupport folder and inside the SharedSupport folder you will find the |
| InstallESD.dmg. This is the 10.7 Lion boot disc image. |
| 4) Copy InstallESD.dmg to another folder like the Desktop. To do so, simply click and drag the file to the desired location |
| while holding down the Option key. |
| 5) Plug in the flash drive and launch Disk Utility (/Applications/Utilities). |
| 6) Make sure the flash drive is properly formatted highlighting the flash drive at the left (make sure to select the device |
| and not the volume shown under it) and clicking the Erase tab across the top right. Then ensure that the Format drop-down |
| menu is set to Mac OS Extended (Journaled) and click the Erase button. Confirm the dialog ensuring that you want to erase |
| the device and all information on it (make sure you backup any existing information on the flash drive before this point). |
| 7) Select the Partition tab on the top right. |
| Using the drop-down menu for Volume Scheme, choose 1 Partition as the partition scheme. |
| Highlight the partition by clicking on it in the space it is shown below the Volume Scheme drop-down and then click on |
| Options underneath it. Select GUID Partition Table and click OK. This will allow the Mac boot from the drive. |
| You may now name the device in the Name textbox. Insure that Format is set to Mac OS X Extended (Journaled). When you |
| have finished, click the Apply button to format the USB device. A warning will pop-up asking if you are sure you want to |
| partition the media. Click the Partition button to continue. |
| 8) Click on the newly created volume listed under the USB device on the left. This volume will have the name of the device |
| you set in the previous step. Click the Restore tab at the top right. In the Source area click the Image… button. Select |
| the disk image InstallESD.dmg and click open (you may also drag-and-drop the disk image into the Source area). |
| In the Destination area, make sure that the USB device’s name is showing. If it isn’t, simply click and drag the volume from |
| the list at the left into the destination area. Click Restore and confirm the dialog informing you the volume will be |
| erased. You will be prompted to enter the admin password for your Mac and the process will begin. |
| The bootable USB device will be created and a progress bar will show the current status of the operation at the bottom of |
| the screen. |
| 9) When the operation is complete, you can verify that the flash drive is now bootable by selecting it and clicking the |
| Info button in the upper left corner of the Disk Utility window. Bootable status will show as Yes. |
| To boot from the USB device, simply hold down the Option key while your Mac is booting up. A screen will appear asking you |
| which volume you would like to boot the system from. Click on the OS X installer USB drive and the system will boot using |
| the USB stick. You will see faster boot speeds using the USB installer compared to a DVD installer disc. |