How to reformat mac mountain lion

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  4. How to Install (or Reinstall) Mac OS X Mountain Lion - dummies

Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. He is the president of Coyote Moon, Inc. 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. 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.

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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. 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.

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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. 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.

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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.

Select your country from the list on the Welcome screen and click Continue.


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Select your keyboard layout from the list and click Continue. Choose whether to transfer user data, applications, and other information from another Mac, PC, or hard drive. You can also choose not to transfer data now. Select the Not Now option. You can transfer data later using the Migration Assistant included with the OS. This way, you ensure that your Mac is up and running with Mountain Lion without any problems before you spend the long time it takes to transfer your data.

Make your selection and click Continue. Enable location services. This feature allows your apps to figure out your approximate location and then use that data for various purposes, ranging from mapping to advertising. You can enable location services at any time, so you don't have to decide now.

Make your selection, and click Continue. The installer asks for your Apple ID. You can skip this step if you want, but if you supply the information now, the installer preconfigures iTunes, the Mac App Store, and iCloud. Step 2 Click on "Disk Utility" and select your computer's hard drive from the sidebar.

Step 3 Select the "Erase" tab and click on Erase" to remove all of your personal data from the computer.

How to Install (or Reinstall) Mac OS X Mountain Lion - dummies

Tip If your hard drive is failing or if you plan to install a new hard drive on your MacBook, then you will not be able to boot into OS X Recovery from a local hard drive partition. In these instances, you will need to load the Recover tool onto an external USB drive before attempting to reset your Mac to factory settings. Warning When you erase your hard drive using the OS X Recovery utility, all of your personal files and data will be wiped from the computer.

Make sure that your information is backed up to an external hard drive beforehand. Video of the Day. Brought to you by Techwalla.