The process is very similar on older versions of Mac OS X, but the screens will look a bit different. If your Mac has OS X Click one of the links below to follow the appropriate instructions for the type of hard drive that you have. If your Mac has a mechanical, spinning hard drive and OS X I recommend securely erasing a hard drive before you recycle it or give it away. The instructions below include the option to re-install Mac OS X onto the hard drive at the end of the process. In Disk Utility, select the external hard drive and then follow the last few steps of these instructions to erase it using one of the Security Options described below.
This process can take many hours if you select the 7-pass overwrite procedure. I recommend starting this process and then letting it run overnight. This option only over-writes the directories on the hard drive. Your files could still be recovered. Zero Out Data— Provides a pretty good level of security.
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All of your files are over-written with a string of zeroes. There are forensics utilities that in theory could retrieve some data.
This is considered sufficient by government standards to erase data from a disk. It writes a random string of ones and zeroes over your data files seven times. It may take several hours or more to complete this process. This option takes an extremely long time, possibly more than one day. Start the installation from a nonworking computer. This will load the "Startup Manager", which displays all of the sources you can boot from.
After a few moments, the DVD will appear on the list of sources. Select it to reboot the computer and boot from the DVD. Choose a language and start the installation.
Once your computer reboots, the installation process will start. You will be asked to choose your language, and then the Welcome screen will appear. Click the Continue button to start installing. Choose your installation type. Click the Options When reinstalling OS X, you will have two different installation options: Choose the process that meets your needs and click the OK button. If you choose this, you can also choose to preserve your user and network settings.
This is not recommended if you are experiencing issues with your current installation of OS X.
- Step 1: Back up!.
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- Step 2: Erase the hard drive;
Any programs you had will need to be reinstalled after choosing this method, or they may not work properly. All data will be erased, so ensure that everything important is backed up. This is the recommended option as it will solve most issues you were experiencing, and gives the best performance. Choose the destination. If you have multiple hard drives or partitions installed in your computer, you can choose which one you want to install OS X on.
The amount of space on the disk and the amount of space OS X requires will be displayed. Select the hard drive you want to install to and click Continue. Make sure you don't install onto a Recovery or Storage drive.
The Safe Mac » How to reinstall Mac OS X from scratch
Choose the software you want to install. The installer will display a list of all the extra software packages that will be installed with OS X. If you don't have a lot of hard disk space, you can deselect some of the less-important files by clicking the Customize Expand the "Print Drivers" section and deselect any of the print drivers you won't need.
Expand the "Language Translation" section and deselect any languages you won't be using. Start the installation. Once you have chosen your extra software options, you can begin the installation of the operating system. Click the Install button to begin. A progress bar will let you know how much time is left during the installation. The installation process is automatic once it begins. Your computer will reboot when the process is complete. Set up the keyboard. The first thing you will be asked to do after the computer restarts is to set up the keyboard.
Follow the on-screen prompts to detect and setup the keyboard. Set your region and keyboard layout. After the keyboard has been detected, you will be asked to set your region and choose your keyboard layout. If you take the computer traveling often, set the region to your home region. Choose whether or not you want to transfer data. Since you performed a clean installation, there will be no data to import.
You will be copying your old backed-up files over later. Choose "Do not transfer my information now" and click Continue. Enter your Apple ID. If you have an Apple ID, you can use it to log in. This will sync your settings with your other Apple devices.
Erase and Install Method for OS X 10.5 Leopard
See this guide for details on creating an Apple ID. Entering an Apple ID is optional. You can also choose whether or not you want to register your software with Apple.
This can help you if you need to get official support. Create an administrator account. The administrator account is the account that has permission to change system settings and install software. If the computer is yours, enter your name in the "Name" field, and a nickname in the "Short Name" field. Oftentimes users will simply use a lowercase version of their name in the "Short Name" field. Your Short Name is used to label your Home directory. It is very difficult to change your Short Name later, so make sure you're happy with it.
The administrator account needs a password.