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Enter a name for the device, and select the format as Mac OS Extended (Journaled) from the drop-down list next to Format ( Figure A).
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Under Partition Layout, select 1 Partition from the drop-down menu.Select the drive you wish to use from the device list and click the Partition tab.Insert the USB Flash Drive (or SD Card) into the Apple computer, and launch Disk Utility.app from the Applications | Utilities folder.With that said, follow the steps below to create a bootable USB installer: User Account with Administrative privileges.Apple computer with Mac App Store (10.6.8+).OS X 10.10 DP1.app (installer downloaded from Apple's Mac Developer site).Before getting started, let's review the requirements for creating a bootable drive:
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