Posted February 28, 2011 by Jimmy S in Apple Mac, Mac OS X Leopard, Mac system administration
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Oct 10, 2007 Burn it and reboot to it. The OS X will install. Restore the dmg file to an external device. An external hard drive or an iPod in hard disk mode will serve as an excellent booting device as well. – Copy your dmg file to your current apple desktop. – In the Utilities Folder in your Applications Folder select Disk Utility. Now you have the installer on the external drive you can use that to install multiple copies of macOS. Plug the external drive into the Mac that you want to install the macOS on. Start up the Mac, holding down the Option/Alt key while it is booting up. Your Mac will display the Startup Manager.
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This recipe will explain how to make a USB Thumb Drive bootable with the OS X Lion Developer Preview installer on it and in turn allow you to install Lion on a Mac without an optical drive (ie Macbook Air line). We will need a copy of the installer dmg (not provided) and a 4GB USB Thumbdrive or Memorycard Reader w/memory card and a Mac to convert the dmg to a bootable usb thumb drive.
Requirements:
This guide lets you restore the .dmg installer file for OS X Lion onto a usb thumbdrive. We can then boot the USB Drive on our Mac to install OS X Lion from it. This is very handy for us Macbook Air users that do not have an external optical drive.
Guide:
1. On your Mac, open up Disk Utility. Click on the USB Drive on the left.
2. On the right pane, go to the Restore tab.
The GUI resembled a blend of Mac OS 8’s Platinum appearance with OPENSTEP’s NeXT-based interface. Macintosh OS X lion – 1.2v3 depended on Rhapsody, a half and half of OPENSTEP from NeXT Computer and Mac OS 8.5.1. Download mojave dmg official support. There was the talk of executing a ‘straightforward blue box’ which would intermix Mac OS applications with those composed for Rhapsody’s Yellow Box condition, yet this would not occur until Mac OS X’s Classic condition. It incorporated a runtime layer called Blue Box for running inheritance Mac OS-based applications inside a different window. Apple File Services, Macintosh Manager, QuickTime Streaming Server, WebObjects, and NetBoot were incorporated with Mac OS X lion 1.0 – 1.2v3.
3. Click on the Browse button and locate the .dmg installer for OS X Lion. (ie mac_os_x_10_7_11a390.dmg)
4. Once you have it chosen, click and drag your USB Thumbdrive from the left pane to the Destination box. (ie THUMBDRIVE in the screenshot) and then click Restore
I recommend erasing the destination, so be sure to backup any data on the thumbdrive prior to this step! This will take a few minutes to do. Once its finished, you now have a bootable OS X Lion install thumbdrive (basically just like what the Macbook Air ships with).
5. Hold Option/Alt after your see the Apple logo appear and boot with the thumbdrive in your Mac.
Choose the USB Drive to install OS X Lion from your USB Thumbdrive!
NOTES:
– I have confirmed this working on a Macbook Air 11″, 2010, 1.6Ghz version.
About Jimmy SInstall Os X Dmg From External Drive Download
Jimmy Selix is an early adopter that loves to be one of the first on the block to have the latest and greatest in technology and gadgets. Another love of his is being able to share his knowledge to others seeking it. Feel free to drop any comments or questions that you may have.
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