You should also note that it is not normally possible to install a version of OS X prior to the version that originally shipped with the particular Mac that you are using. With USB 2.0 the experience is quite slow. This is down to the transfer speeds possible. It is possible, theoretically, to run OS X from any of these different types of media though–practically speaking–it is probably best to choose USB 3.0 or Thunderbolt. You can install OS X to a choice of media, such as USB drive, SD Card or an external hard drive connected via USB 2.0, USB 3.0, FireWire or Thunderbolt. Whilst this tutorial is entitled How to Install OS X Yosemite Onto an External Volume, the same principles apply for installing Lion, Mountain Lion or Mavericks on to an external volume.
In this tutorial I'll show you how to install OS X on an external drive without replacing the particular version of the operating system, on the Mac, itself.
This is easy if you have a number of Macs, less so if you have just one. Sometimes it would be great to be able to try different versions of the OS X operating system before upgrading.
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