How to upgrade to OS X Yosemite – Apple Support. Go to Section 4 and click on Download OS X Yosemite. This downloads InstallMacOSX.dmg to your Downloads folder. The next section can only be done on a mac that is capable of running Yosemite, a mac that came preinstalled with an OS later than Yosemite will refuse to do the next bit. Download the Yosemite installer from the Mac App Store and make sure it’s in your main Applications folder (/Applications)—it’s called Install OS X Yosemite.app. Connect to your Mac a.

Want to learn how to create a bootable USB installer for OS X Yosemite?. Here is the complete step by step guide which you can follow on your MAC create the bootable USB disc. We all know that Yosemite OS X is the latest operating system form Apple, which comes with lots of new features and improvement. If you are interested in new OS and want to try it then sign up for the OS X Beta Program here, which will allow them to test the new OS, if selected.

Once you have the installation app for Yosemite (Install OS X 10.10 Developer Preview), don’t install it directly, other wise you will lose the file and can’t make the USB disc. To get started all you nee a *GB or above USB drive, Apple computer with Mac App Store (10.6.8+) and OS X Yosemite installer.

Create OS X Yosemite Bootable USB Drive

Step 1. Insert the USB drive or Disc on youir MAC and run the Disk Utility app from the Applications > Utilities folder.

Step 2. Now in the app select the USB drive and Selct the Partition Tab.

Step 3. Under Partition Layout, select 1 Partition from the drop-down menu. And enter the Partition information Name: ”yosemite”, Format: “Mac OS Extended (Journaled)”.

Step 4. Click the Options... button and Select GUID Partition Table. After that hit the “Ok” button then “Partition” button.

Step 5. Now the partition process will start and this will take some time to format and making USB drive as a 1 partition

Now the USB part is over and lets move to the OS X Yosemite installer package.

Step 6. Go to Applications again and find the Install OS X 10.10 Developer Preview app that you downloaded.

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Step 7. Right-click the installer and select Show Package Contents from the context menu. See the Screenshot below:-

Step 8. Now navigate to Contents -> SharedSupport and open InstallESD.dmg

Step 9. This will start the verify process on your MAC. Wait for some time…….

Step 10. Once the verify process is done you will see the Package Folder.

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Step 11. Don’t do anything with this Packages folder just yet. First, we need to unhide the files located in this newly mounted OS X Install ESD image.

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Step 12. Launch Terminal.app to enter a command to unhide the file and folder on your MAC.

Step 13. Enter the below mention two commands one by one:-

defaults write com.apple.finder AppleShowAllFiles TRUE

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killall Finder

Step 14. Now you will see three more files next to the Package folder (Step 10)

Step 15. Switch back to Disk Utility.app to select the partition name created in step 3.

Step 16. Now drag the partition from the device list to the Destination box. Also, drag the BaseSystem.dmg to the Source path
Hit the Restore button.

Step 17. Now a new popup screen appears. From here click on Erase to start the restore process, then enter in your admin password and hit OK to proceed.

Step 18. Once the restore process is done, you will see a new window son your screen. Like the screen below:-

Step 19. Here, open the “System” > “Installation” folders and move the Packages file to trash.

Step 20. Now copy the Packages folder from Step 10 and paste it into the Installation folder that you just opened in previous step.

Step 21. Now Hide the system files again using this command on terminal window

defaults write com.apple.finder AppleShowAllFiles NO

That’s it!. To perform a clean install on your MAC, simply insert the USB drive that you created, power on the computer, and hold down the [option] key to access the boot selection menu. From there, select the USB drive partition, and follow the prompts to install OSX 10.10 on your Mac.

Mac OS users who are already running Mavericks on their desktop computers are now eligible for free upgrade to OS X 10.10 – Yosemite.

Those who are facing performance issues with direct upgrade via App store or installing OS X for the first time on their Macs can follow a simple step-by-step guide to perform a clean install of Yosemite using Disk Utility.

Before we delve into the detailed process of clean installing OS X Yosemite on Macs, there are a few things that need to be taken care of.

Prerequisites

a) Ensure your Mac is compatible with OS X Yosemite. These are the supported devices:

• iMac (Mid 2007 or newer)
• MacBook (Late 2008 Aluminium, or Early 2009 or newer)
• MacBook Pro (Mid/Late 2007 or newer)
• MacBook Air (Late 2008 or newer)
• Mac mini (Early 2009 or newer)
• Mac Pro (Early 2008 or newer)
• Xserve (Early 2009)

b) Back up important data and settings (photos, videos, music files, documents and the like) on your Mac to an external hard drive. You can do this by using the Time Machine feature in Mac OS X, or third-party software such as Carbon Copy Cloner.

c) Create a bootable USB flash drive with a storage size of at least 8GB.

d) Download OS X 10.10 Yosemite Final from the Mac App Store and save it to the Applications folder – its default location.

How to Create Bootable USB Flash Drive

First, create bootable USB flash drive. Here is how you do it, courtesy of Redmond Pie:

• Plug in your USB drive into the computer and open Disk Utility (in Applications).
• Select the USB drive from the left sidebar and click on Erase tab.
• Choose Mac OS Extended (Journaled) in the format box and let the name be Untitled (default).
• Now click on Erase button and wait until the format process completes.
• Then choose Partition tab and select 1 Partition from Partition Layout dropdown menu. Click on Option and ensure GUID Partition Table is selected as the partition scheme, with its name set to Untitled.
• After downloading the OS X 10.10 Yosemite instakker from the Mac App Store, just quit the installer and set the downloaded file's name to Install OS X Yosemite.app.
• Launch the Terminal app (in Applications/Utilities) and type or paste the following command in, and then hit Enter:

sudo /Applications/Install OS X Yosemite.app/Contents/Resources/createinstallmedia –volume /Volumes/Untitled –applicationpath /Applications/Install OS X Yosemite.app –nointeraction

• This will create the bootable USB flash drive. This takes between 10-20 minutes. Do not interrupt the Terminal or eject the flash drive during the process. Once the process completes, you will see the message 'Copy Complete. Done.'

The OS X Yosemite bootable USB flash drive will be ready for use and you can start the clean installation process.

How to Clean Install OS X Yosemite on Your Mac

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Step 1: Ensure the bootable USB flash drive is plugged into your Mac and restart the computer. As soon as the start-up chime plays, press the Option key (Alt).

Step 2: Choose the USB drive on the start-up drive selection screen and hit Enter/Return on the keyboard.

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Step 3: Wait until the Yosemite installer appears on screen. This could take a few seconds or minutes.

Step 4: Click on Disk Utility and then hit Continue.

Step 5: Click on Macintosh HD from the left hand-side pane and then hit Erase tab on the top-right portion of the window. Leave all the settings at their default values and then hit Erase button at the bottom right. This will wipe all files stored on your startup hard drive.

Step 6: When the erasing process is complete, return to the first screen where you selected Disk Utility. Now click on Install OS X and then hit Continue.

Step 7: Choose the Macintosh HD partition you erased in step 5 and then click Install.

If you have followed all the steps correctly, your computer should now boot right into the newly installed operating system, OS X Yosemite, and you could cherish its stunning new UI.

(Source: Redmond Pie)

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How to Clean Install OS X Yosemite via Bootable USB Flash Drive