Here’s how to burn Yosemite to a USB drive instead.
Insert an 8GB (or larger) flash drive.
Here’s what you better do:
Download the Yosemite installer, if you haven’t already.
Insert an 8GB (or larger) flash drive, and give it a name.
For this tutorial, we’ve named itUntitled.
see to it the drive is formatted OS X Extended (Journaled).
If it isn’t, hop into Disk Utility and format it so it is.
Open up the Terminal, either through spotlight or by double-clicking on it in /Applications/Utilities.
Let the command work its magic.
Don’t interrupt it until you see the final line that saysDonebefore it returns you to the prompt.
This could take as long as a half hour, so be patient!
Check outthis Macworld articlefor other options if the above doesn’t work for you.