Make a bootable OS X 10.10 Yosemite

I just brought a MacMini Quadcore 2012 from Apple, and think that I should install Yosemite on it,  After the pain and huge among of bandwidth waste on trying to get Yosemite from Apple App Store, I decided that I should simply create a bootable flash drive and use it to install Yosemite.  I followed the instruction here using the first command line option ("Option 1: Use createinstallmedia").  It worked out great, but I need make sure that I formatted the drive in Mac Journal format first, and close Disk Utility before executing the command line.  It did take a while.  In fact, it took almost 20+ minutes to complete that process.  But it indeed work.