Boot disk utility mac mountain lion

When you download Mountain Lion, the installer starts automatically. Quit the installer and read the rest of this guide before starting the installation process. A supported Mac. A target drive or partition. The target volume must be at least 8GB in size. You can squeeze Mountain Lion onto a smaller drive, but there won't be much space left for user data and applications. A minimum volume size of at least 60GB provides sufficient room for the OS, user data, apps, and some free scratch space. It contains a bootable system with utilities for performing basic disk repair, as well as the ability to reinstall the OS if necessary.

A current backup.

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For most people, this is Mac's startup drive. This guide covers performing a clean install of Mountain Lion on a startup drive. Insert the bootable media or connect it to your Mac and then restart the Mac while holding down the Option key. This causes the Mac to display its built-in startup manager, where you select the device you want to boot from.

Use the arrow keys to select the bootable Mountain Lion installer you created earlier and then press the Enter key to start the boot process. That's why you made your own bootable media. Select Disk Utility from the list of options and click Continue. Select your Mac's startup volume from the list of devices in Disk Utility.

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If you never changed its name, the startup volume is listed as Macintosh HD. Be sure to select the volume name and not the device name, which is usually the name of the physical drive — GB WDC WD5 , for example. Click the Erase tab. Give the startup drive a name or use the default name. Click the Erase button. When you are asked if you are sure you want to erase the drive, click Erase. Your computer's eligibility must be verified before you can download and restore OS X. This happens because the bootable media you created doesn't contain all the files necessary for the install.

How To Make A Bootable Disk Or USB Drive Of OS X Mountain Lion | Cult of Mac

The installer checks for any missing or new files it needs, downloads the files from Apple's servers, and then starts the installation process. Click Continue. Read through the license and click the Agree button. Click the Agree button a second time to confirm you didn't accidentally click the Agree button.

The installer displays a list of drives you can install Mountain Lion on. Select the target drive the startup drive you erased earlier and click the Install button. The installer checks the Mac App Store for updates and any other files it needs. After restarting, your Mac starts the system setup process, including creating an administrator account and creating an iCloud account if you want one.


Therefore, since my MacBook was from late , it provided me tools that would only install and repair disks that work with OS X Lion. My disk utilities to repair my drive were now useless. So I was forced to wipe and install Lion from the internet recovery utility. The good news is that getting to internet recovery mode is as easy as starting the regular recovery mode except with some extra steps.

You'll be happily greeted by a familiar yet older looking version of the repair utilities where you can restore from Time Machine, install OS X not a typo since OS X was the default install on my Mac , or run Disk Utility Again useless in my case since APFS was what my internal hard drive had running. You'll be tempted to try and run a restore from Time Machine and your certainly free to try it out to see if things will automatically start working and if your APFS volume is intact you may be able to.

However, I had to do a complete OS X install. You can follow our guide to install a fresh copy of OS X if you need help. I strongly suggest to create an Install account rather than use your normal account name when preforming a fresh install so that when you come to the restoration process, you avoid any compatibility issues with having similar account names.

Once again, you'll need to wait a while while your Mac downloads the installation file from the internet. Once re-installed, you'll quickly want to upgrade to macOS High Sierra. Unfortunately, you can't.

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  • Create Bootable Copies of the OS X Mountain Lion Installer?
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You need to first upgrade to a minimal macOS version of Searching for older versions of macOS in the App Store yields no results. But if you've downloaded and installed previous versions on your Mac, you can simply select it from your purchased apps list.

How to make a bootable Lion install disc or drive

The installer will automatically start and you can follow the prompts or you can look at how to upgrade your macOS install by following our guide. Again the installer will automatically start and you simply follow the prompts or follow our macOS installation guide.

Finally, we're ready to restore our backed up data. If you back up using Time Machine, here's what you do. Now you need to wait for the restore to complete which can take many hours depending on the amount of data to restore and how you're transferring that data whether it be via ethernet cable or Wi-Fi. When complete, log into your restored account and delete the "installer" or "Setup" account if you created one earlier.

That's finally it. Let us know in the comments! If you're no fan of Memoji stickers you might be able to disable them soon if an iOS USB-C is the future, and grabbing an external hard drive is a great way to store backups, music, movies, files, and more! Retrieved February 16, Archived from the original on July 10, Retrieved July 9, The Verge. Archived from the original on February 18, Retrieved February 21, June 11, Archived from the original on June 16, Retrieved June 24, Archived from the original on August 27, Retrieved August 27, The Next Web.

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