Apple Clean Install Yosemite

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A clean install will erase all the contents and partition on your disk drive. Make sure you take back up of your important files before proceeding. Download OS X Yosemite. To do a clean install of OS X Yosemite, you'll need a blank USB flash drive or External HDD that is at least 8GB in size. Keep the installer from being deleted. Like all recent versions of OS X, Yosemite is distributed through the Mac App Store. As with the Mavericks installer, if you leave the Yosemite beta.

• Bootable USB/HDD

Note!: A clean install will erase all the contents and partition on your disk drive. Make sure you take back up of your important files before proceeding.

Download OS X Yosemite

• To do a clean install of OS X Yosemite, you'll need a blank USB flash drive or External HDD that is at least 8GB in size.

• You'll also need to download OS X Yosemite onto your existing Mac.

• Download OS X Yosemite from Apple Store.

• You will be prompted to continue download, Click on Continue

• Provide your Apple ID and Password and click on Sign In

Erase USB/HDD Drive

• Open Disk Utility Application and Select your USB/HDD drive and click on the 'Erase' tab.
• Select Mac OS Extended (Journaled) as the format type.
• Click the Erase button. This will take a few minutes, but will erase your USB/HDD drive will be erased and format it with the proper file system.

Bootable USB/HDD

Download DiskMaker X

• Download DiskMaker X
• Once its downloaded, just install it.

Make Bootable USB/HDD Drive

• Open DiskMaker X by pressing Command ⌘ and space

• Click on Yosemite(10.10)

• We already downloaded OS X Yosemite, So click on Use this copy

• Click on Another kind of disk

• Make sure you choose right USB/HDD (Will be formated)

• Make sure you selected right USB/HDD

• Next step provide administrator password, click on Continue

• Its take some time to format selected USB/HDD drive.

• Provide administrator password and click on OK

• The installation may take a little time, so grab a cup of coffee and relax.

• We just make Bootable USB/HDD.

Boot from USB/HDD

• Start Mac Book and hold the Alt/Option key on your keyboard as soon as you hear the Mac's startup chime.
• After a few seconds, you'll see all of the bootable devices appear on your screen.

Post Navigation

Remove the Boot Camp partition only with Boot Camp Assistant, not with Disk Utility.

Install or Reinstall OS X from Scratch

Macbook screenshot to clipboard. Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.

Boot to the Recovery HD:

Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.

Erase the hard drive:

Remove the Boot Camp partition only with Boot Camp Assistant, not with Disk Utility.

Install or Reinstall OS X from Scratch

Macbook screenshot to clipboard. Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.

Boot to the Recovery HD:

Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.

Erase the hard drive:

1. Select Disk Utility from the main menu and click on the Continue button.

Apple Clean Install Yosemite Dmg

2. After DU loads select your startup volume (usually Macintosh HD) from the

left side list. Click on the Erase tab in the DU main window.

Install Yosemite From Usb

3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on

the Security button and set the Zero Data option to one-pass. Click on

the Erase button and wait until the process has completed.

Clean Install Yosemite

4. Quit DU and return to the main menu.

Install Yosemite On Mac

Reinstall OS X: Select Reinstall OS X and click on the Install button.

Note: You will need an active Internet connection. I suggest using Ethernet if possible

because it is three times faster than wireless.

Apple Download Yosemite

Jan 25, 2015 11:55 AM