Erasing the disk takes a few seconds, but copying the installer files can take 30–45 minutes depending on the speed of your drive.Double check the command to make sure there aren’t any typos, then press Enter.For the path, you can drag and drop the app into Terminal just as you did before. Replace YOURVOLUME and YOURINSTALLAPP with the drive name and the Yosemite app path, respectively. At the end of the file path, add /Contents/Resources/createinstallmedia -volume /Volumes/YOURVOLUME - applicationpath /YOURINSTALLAPP.
In Terminal, type sudo and drag and drop the Yosemite app into the Terminal window. In Finder, navigate to the folder where the Yosemite install app is located. Launch the app and follow the steps below. You’ll need to enter some commands into Terminal. Step 2: Terminal Commands Terminal Commands The drive is now ready for Yosemite’s image to be copied over. When you’ve finished, click Erase and confirm by clicking Erase once more. One word is best as OS X will change the name later anyway. In the Format field, you can select FAT or Mac OS Extended (Journaled).Įnter a title for the drive in the Name field. Select the device in the left pane and click the Erase tab. With the flash drive in hand, connect it and launch Disk Utility. Step 1: Formatting the Flash Drive Formatting the Flash Drive A computer running OS X 10.9 Mavericks or newer (that’s what I’m using for this tutorial, so I can’t guarantee it works on older versions). An flash drive with 8 GB or more capacity. OS X Yosemite install file (re-download it if your computer deleted it after installing the OS or make this recovery drive before you install the OS). Here’s a small checklist to run over first: You’ll need a few things before you can begin creating a recovery drive. You’ll need to be comfortable typing a few things into OS X’s Terminal, have an 8 GB or larger flash drive laying around, and 45-minutes to accomplish the task. 
Creating one may seem like an intimidating task, but it’s really not that hard.
It’s always good to have a backup of an operating system laying around in case you need to update an old computer or restore one quickly without Internet.
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