Clean Install of OS X Yosemite

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.

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