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How to make a bootable OS X Yosemite install drive?
Connect to your Mac the properly formatted hard drive or flash drive you want to use for your bootable Yosemite installer. In Disk Utility, find this destination drive in the left sidebar. You may see a couple partitions under the drive: one named EFI and another with the name you see for the drive in the Finder.
How big of a drive do I need to install Yosemite?
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 properly formatted 8GB (or larger) drive. Rename the drive to Untitled.
How do you install OS X on a USB drive?
Alternatively, you can just hold down the C button while starting up to boot directly into the USB drive. Then just follow the install instructions and wait for your new Yosemite experience. When you come to the Install OS X screen, make sure to select the right disk.
When did Mac OS X Yosemite come out?
Apple released the new Mac OS X 10.10 Yosemite in the Mac App Store for everyone to download and install for free on October 16th, 2014, but downloading a 5+ GB file for each of your computers will take some serious time. The best thing to do is download it once and create a bootable install USB drive from the file for all of your Macs.
Can a Yosemite install drive be booted into snow leopard?
As mentioned above, the createinstallmedia tool works only in Lion, Mountain Lion, Mavericks, or Yosemite—you can’t create an installer drive this way while booted into Snow Leopard. If you need to create a Yosemite beta install drive while booted into Snow Leopard, you should use the Disk Utility instructions, below.
Is there a way to make a Yosemite installer?
If you’re comfortable using Terminal, createinstallmedia is a relatively simple tool to use. As mentioned above, the createinstallmedia tool works only in Lion, Mountain Lion, Mavericks, or Yosemite—you can’t create an installer drive this way while booted into Snow Leopard.