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But I still had the installation files and the partition read "Mac OS X Install" so I selected that, and then it went through a proper install sequence, putting a fresh copy of Lion on the drive. It shot up an installation screen with a progress bar, but when I rebooted, it didn't actually install Lion on the target volume. I couldn't get it to install within Lion on an external partition. The installer will ask for confirmation and shutdown. Just right click on the Dock icon and select "quit". You don't need to force quit the installer. The window will remain there asking for user input till it gets it.Ģ. You don't have to worry about the installer restarting. A few things to note from my experience.ġ. I tested it and it does indeed work just fine.
You can burn this to a DVD, or image it to a USB flash drive to create a boot disk.
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You should now have a file called InstallESD.dmg in the Mac OS X Install Data folder. 
Do this quickly, as it may automatically reboot for you after a timeout period (although if you've got an unsaved document open, you should be able to prevent that).
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Once the installer finishes download and prompts you to restart your Mac, force-quit it. This will probably take a while, as it's a very large download. This will be fine as long as you don't let the app restart your machine. Once the file finishes downloading, the installer will extract the InstallESD.dmg image from it and delete the package. It will be the file in the folder with the largest file size. Of the files it puts in there, the interesting item is a package with a funky name (on my system, it was ''). The installer will start downloading some packages into a folder called Mac OS X Install Data on the root of the drive you're installing onto. This will give you a little insurance against the installer rebooting the system, since the app won't let the system reboot until you respond to its message asking whether you want to save the document or not. commands in the File menu (I used TextWrangler) and make a new unsaved document, and type a few things in it. Open an old-style (non-autosaving) application that still uses the traditional Save, Save As., etc. #Mountain lion 10.7 free download password#
Enter your admin password when prompted, and the installer will start downloading. As long as you don't let the installer reboot, it shouldn't be able to install anything, but I like to err on the side of caution.) (Or the boot partition if you're feeling gutsy. Once it asks you for a disk to install on, choose the external drive or spare partition. Surprisingly, it launches, even when booted into a standard Mac OS X user account from the hard drive! Now, from the newly mounted Mac OS X Base System image, double-click the 'Install Mac OS X' application at the root of the disk. Hdiutil attach "/Volumes/Recovery HD//BaseSystem.dmg" The disk image inside the recovery HD is invisible, so use the Terminal to mount that too:. Replace above with the identifier from step 2. Type the following command to mount the recovery HD:ĭiskutil mount readOnly /dev/. It will be something of the form diskXsY, where X and Y are numeric digits. Look for 'Recovery HD' in the list, and note its identifier. Open the Terminal, and type this command to list all partitions on your hard drive or SSD:. However, it is possible to capture the installer and interrupt the install, so that it doesn't get a chance to delete itself. Unfortunately, it deletes itself after installation, so it doesn't give you a chance to make a boot disk that doesn't involve network access. A large USB flash drive might work, but I haven't tried it.Īs we all know, the Recovery HD lets you reinstall Lion by downloading it from Apple's servers. An external hard drive or separate partition is great. To avoid messing up your one and only good Lion installation, I recommend getting an external drive big enough to install Lion on. #Mountain lion 10.7 free download full#
By following this hint, it should be possible to get a full Lion install disk for those machines that won't require network access to install. This seems to work on my 2008 MBP machine with the App Store version of Lion installed on it, but it should be of particular interest to users of the new MacBook Airs and MacBook Pros which don't come with an install disk, but can't install the App Store version of Lion. I've found a way to get a full Lion installer by capturing the installer files that the recovery partition downloads.
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