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First step is to download OS X Yosemite installation file. The download size is about 5.2 GB and can. See How to make a bootable OS X 10.10 Yosemite install drive at macworld.com. Option 2 worked for me: Find the Yosemite installer on your Mac. It’s called Install OS X Yosemite.app and it should have been downloaded to your main Applications folder (/Applications). Right-click (or Control+click) the installer, and choose Show Package.

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:

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• 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

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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

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.

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)

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

If you wish to use DiskMaker X to create the bootable OS X 10.10 Yosemite USB drive, here is what you need to do:

1. Connect the USB drive to your Mac.
2. Open DiskMaker X and select Yosemite (10.10). ...
3. Select Use this copy to use the Install OS X Yosemite app from the Applications folder. ...
4. Select An 8 GB USB thumb drive.

How do I create a bootable USB drive for Mac OS X 10.10 Yosemite?

Open up Disk Utility and do the following.

1. Select the USB drive (not the partition)
2. Go to the Partition tab.
3. Change the 'Partition Layout' to 1 Partition.
4. Rename it Yosemite (or whatever you want)
5. Select Mac OS Extended (Journaled) as the 'Format'
6. Click the Options... button.

How do I create a bootable Mac OS X drive?

Download the macOS Sierra installer and Disk Creator.

1. Insert an 8GB (or larger) flash drive. ...
2. Open Disc Creator and click the “Select the OS X Installer” button.
3. Find the Sierra installer file. ...
4. Select your flash drive from the drop-down menu.
5. Click “Create Installer.”

How do I download Yosemite to USB?

How to Install Mac OS X Yosemite on a USB Flash Drive

1. Download a copy of Yosemite from Apple. ...
2. Reformat your USB drive using Disk Utility. ...
3. Select the drive and switch to the Partition tab. ...
4. Click on the “Options” button and Choose “GUID Partition Table.” Click OK and then Apply. ...
5. Start the install of Yosemite and agree to the user agreement.

How do I download OS X Yosemite installer?

OS X Yosemite installer. You can download the installer from the Mac App Store. Once complete, you'll find the download in the /Applications/ folder, with the file name Install OS X Yosemite. A USB flash drive or another suitable bootable device.

Can you still download Yosemite?

3 Answers. You should be able to download Yosemite from the App store if you login with an account that had previously acquired it. If the USB stick was made with an App store copy of 'Install OS X Yosemite. app', it will work on any hardware that existed prior to the release of the copy you downloaded.

How do I make a disk bootable?

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Create a bootable USB with external tools

1. Open the program with a double-click.
2. Select your USB drive in “Device”
3. Select “Create a bootable disk using” and the option “ISO Image”
4. Right-click on the CD-ROM symbol and select the ISO file.
5. Under “New volume label”, you can enter whatever name you like for your USB drive.

How do I make my OSX High Sierra bootable USB?

Create a bootable macOS installer

1. Download macOS High Sierra from the App Store. ...
2. When it's finished, the installer will launch. ...
3. Plug in the USB stick and launch Disk Utilities. ...
4. Click the Erase tab and make sure Mac OS Extended (Journaled) is selected in the format tab.
5. Give the USB stick a name, then click Erase.

How do I reinstall Mac OS from USB?

Install macOS from the bootable installer

1. Make sure the bootable installer (USB flash drive) is connected to your Mac.
2. Shut down your Mac.
3. Hold down Option/Alt and press the Power button.
4. The startup device list window should appear displaying a yellow drive with Install (software name) below it.

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What is the next upgrade from Yosemite 10.10 5?

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El Capitan is Apple's marketing name for OS X version 10.11, the latest update to your Mac's system software. If your Mac is running Yosemite (10.10), Mavericks (10.9), or Mountain Lion (10.8), it can run El Capitan. Beginning September 30, you can download El Capitan straight from the Mac App Store.

Is Mac operating system free?

Apple has made its latest Mac operating system, OS X Mavericks, available to download for free from the Mac App Store. Apple has made its latest Mac operating system, OS X Mavericks, available to download free from the Mac App Store.