If you want to securely erase the drive choose Security Zero Data One-Pass. Now choose your Startup Disk in the sidebar on the left, and click on the Erase tab. Select Disk Utility and click on Continue. How do I restore my Mac with Time Machine.Restart the Mac by clicking on Apple > Restart and hold down the Command and R keys until the Recovery Mode Utilities window appears.
Mac os 10.8 dmg mac os#
You need an internet connection to install Mac OS X.
Mac os 10.8 dmg how to#
How to reset a MacBook: restore your Mac to the original factory settingsįirst of all make sure you are connected to the Internet (open Safari and browse around).
Choose your main hard drive in the source, and your external hard drive in the Destination. The best way to do this is using a program like Carbon Copy Cloner or SuperDuper along with an external hard drive. Also you can keep this around and pick files from it to copy over to the rolled back installation. This can be useful in case of emergencies (you can boot from the hard drive) and you can re-clone it back to the main drive if there’s a problem. It’s important to make a clone of the whole hard drive and keep it around for a while. This will download the Installer file to your Applications folder. Look for the Mountain Lion purchase and click on Download next to it. If you purchased it from Apple then you can open the App Store, and click on Purchases. If you haven’t go this file, then you’ll need to go hunting for it.
Mac os 10.8 dmg mac os x#
Open the Applications folder and check for the Install Mac OS X Mountain Lion folder. You may already have this if you’ve done an install before. The first thing you need to do is get a copy of the Mountain Lion installation file. Step 1: Get a copy of Mac OS X Mountain Lion But for general use Mavericks is better than Mountain Lion in almost all respects (including speed) so we’d suggest you stick with the newer operating system if possible. Select Software Update.It’s by no means easy to roll back to an earlier operating system, and we wouldn’t advise it unless you have a real need to be on the older operating system (say if you have a vital program that requires the older operating system, or you’re testing out on an older operating system).Information and have the option to transfer data from another computer Once the installation is complete, you'll be asked to enter basic Install and enter your Apple ID information if prompted. The instructions and then choose your hard disk. Click Reinstall OS X, and then Continue.Options., adjust the slider accordingly, and click If you would like to securely erase your data, click Security.Next to "Format:", make sure Mac OS Extended (Journaled).In Disk Utility, from the left column, click your hard.Restart your computer, and immediately hold down command-r until the gray Apple logo appears. Reinstalling while erasing everything on your computer from the Apple menu, and install any available updates. When the installation is complete, select App Store.
Click Install, and enter your Apple ID information if prompted. Follow the instructions on the screen, and then choose your hard disk.
If prompted, select your main language and then click the arrow.Restart your computer, and immediately hold down command-r until the gray Apple logo appears.