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You ll be using this drive completely for os x yosemite so don t waste a larger drive if. Download os x yosemite.

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To start up from macos recovery turn on your mac and immediately press and hold one of the following.

Reinstall mac os x yosemite. Some users like to perform what is known as a clean installation of mac os x though which is essentially wiping the mac drive and starting fresh with a brand new untouched install of os x yosemite and then manually copying or accessing files and re installing apps. Decide whether to erase format your disk. A file named installmacosx dmg will download to your mac.

When it s finished close out disk utility and select reinstall os x from the menu. Once you ve done that here s how to install reinstall or upgrade yosemite step by step. If you still need os x yosemite use this link.

For the first several days that yosemite is available apple will display a banner promoting it. To do a clean install of os x yosemite you ll need a blank usb flash drive that is at least 8gb in size. Start up from macos recovery.

Read it and click agree. Choose the disk on which. Install the macos installer.

As were the last few versions of os x yosemite is available from the mac app store. A file named installmacosx dmg will download to your mac. Near the center of the window select the format drop down list and select mac os x extended journaled as the type.

Reinstall from macos recovery. Boot from your recovery hd partition by restarting your mac while holding down the command r keys. To get your copy select app store from the apple menu.

The yosemite software license agreement screen appears. Click erase this will erase your main drive and allow some time for the drive to format. Most mac users who are upgrading to os x yosemite should go through the standard process via the mac app store and start the installation from there it s by far the easiest approach and it generally goes flawlessly.