You can do it quickly by searching via Spotlight. This will remove everything in the flash drive.

Should you do a "clean install" of Mountain Lion? | Macworld

Keep a backup of the files within if you still need them, then come back to this section. Once the flash drive is formatted, re-select the formatted USB drive from the left menu, and click the Restore tab. Do the following steps carefully:.

First, a reboot! Then, select the Mac OS X on the right. Click the Erase button button and everything including files, applications, settings, etc in your Mac will be completely deleted. Do this with caution as there will be no way for recovery from this point onwards. This time, select Reinstall OS X , the second option from the list. Instructions here , plus how to create a USB boot disc also in these instructions. Page content loaded. Aug 1, 7: Aug 17, 2: I readed on the net, that it is ok and can by bypassed, but in my case my MBP-R when i boot up in disk startup mode - it not recognize my Bootable ML.

I have original copy from App Store - everything is fine. What can i do with this copy of OS?


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I need clean install, but i cannot do it. Sep 4, Since I have not purchase the mountain Lion I can't install on to my computer.

Should you perform a clean install of Mountain Lion?

Also I don't have a option to purchase the mountain lion now. Feb 5, 3: If you have further question please come up new question forum. Use the arrow keys to select the bootable Mountain Lion installer you created earlier, then press the enter key to start the boot process. That's why we made our own bootable media.

Select Disk Utility from the list of options, and click Continue. When Disk Utility opens, select your Mac's startup volume from the list of devices. If you never changed its name, the startup volume will be listed as Macintosh HD. Be sure to select the volume name and not the device name, which will usually be the name of the physical drive, for instance, " GB WDC WD5.

You can give the startup drive a name, or use the default name. Click the Erase button. You'll be asked if you are sure you want to erase the drive. Click Erase. The Install OS X window will open. Click Continue. A sheet will drop down, informing you that your computer's eligibility will be verified before you can download and restore OS X. This happens because the bootable media we created doesn't contain all of the files necessary for the install. The installer will check for any missing or new files it needs, download the files from Apple's servers, and then start the installation process.


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Read through the license, and click the Agree button. You'll need to click the Agree button a second time, just to make sure you really agree with the license and didn't accidentally click the Agree button the first time.


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The installer will display a list of drives that you can install Mountain Lion on. Select the target drive the startup drive you erased in the steps above , and click the Install button. The installer will check the Mac App Store for updates and any other files it needs. After your Mac reboots, a progress bar will display the time remaining in the installation.

This will vary, depending on the Mac, but it should be relatively short, less than 30 minutes in most cases. When the progress bar hits zero, your Mac will automatically restart. After restarting, your Mac will start the system setup process, including creating an administrator account, creating an iCloud account if you want one , and setting up the Find My Mac service if you choose to use it. The Welcome screen will display.

Select your country from the list, and click Continue. Select your keyboard layout from the list, and click Continue. You can choose to transfer user data, applications, and other information from another Mac, PC, or hard drive; you can also choose not to transfer data now.

Can you perform a clean install of Mountain Lion?

I recommend selecting the Not Now option. You can always transfer data later using the Migration Assistant included with the OS. This lets you ensure that your Mac is up and running with Mountain Lion without any issues before you spend the long time it takes to transfer data.

How to Clean Install Mac OS X Mountain Lion

Make your selection and click Continue. 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.