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How to create a bootable Apple OS X Yosemite USB drive | ITProPortal
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Select OS Version you want to install. Unibeast — Support Options. Unibeast — Mountning Volumes.
Highlight your target hard drive for the Yosemite installation in left column. Click Partition tab 4. Once you install Yosemite, the file will automatically erase itself, so it's important to make a bootable drive first. If you want to install first and then make a bootable drive, make a copy of the installer app in another location so you can access it later. Worst case scenario is downloading the large file again from the Mac App Store, but then why make a bootable drive? By far the easiest way to create a bootable drive is to use the DiskMaker X application, which automates the entire process in the next method.
To start out, download the newest version of DiskMaker X from its website. Currently, that's the Yosemite Beta version. Update: the public Yosemite version is out now, and you can download it from here , here , or here. Once download, open it up and select "Yosemite Beta" or "Yosemite You'll be warned about it being a beta software, but once you get passed that, make sure to select "Use this copy" to use the installer app it found in your Applications folder. If you have more than one installer like I do, you'll want to make sure to do it manually.
Next, select what type of drive you have. Afterward, select your drive from the list. Then just follow the rest of the prompts to start the disk-making process. It could take anywhere from 15 minutes to to 45 minutes to finish, depending on your USB flash drive. If it's more toward the latter, you might get a " AppleEvent timed out " error, but it should still work, according to the developer it worked for me.
If you're more comfortable with Terminal commands, this is the method for you. Just make sure your USB drive is already formatted correctly before proceeding.
This should all be one line. After you get it in there, just hit the Enter key. Type in your admin password to continue and the Enter again. You won't visibly see your password typing, but it's happening—believe me. Now just wait. This could be fairly quickly or very long, depending on your system and USB drive. If you don't want to use DiskMaker X or Terminal commands, this is another option for you. It's a lot more complicated, but gets the job done.
Open up Disk Utility and do the following. Then just wait for it to finish erasing and repartitioning your USB flash drive. It will mount back up when it's done. Now, don't do anything with this Packages folder just yet. And don't worry, we'll be undoing this at the end of this guide. The one we need here is BaseSystem.