Apple has made digital distribution and in-place upgrades of OS X incredibly easy thanks to the Mac App Store, but sometimes nothing can beat the convenience and flexibility of a physical OS X USB installer.
I recommend to use SanDisk USB 3.0 with 8GB or more capacity. If your Mac supports USB 3.0, a USB 3.0 drive, will make both the installer creation process and the actual OS X El Capitan installation much faster.
Here are the steps to create an OS X 10.11 El Capitan bootable USB installer with DiskMaker X.
Step 1. Download OS X 10.11 El Capitan from Mac App Store
Currently, this installer is only available to registered members of the Apple Developer Program, but it will soon be available to the public when the OS X El Capitan public beta program launches in July.
The OS X El Capitan installer app will download to your Mac’s Applications folder and automatically launch the installer app. Press Command-Q to quit app.
Step 2. Download and install latest DiskMaker X
Step 3. Insert USB key
Step 4. Go to /Applications and rename “Install OS X 10.11 Developer Beta.app” to “Install OS X Yosemite.app”
Step 5. Run DiskMaker X and choose Yosemite (10.10)
Step 6. DiskMaker X will find Install OS X Yosemite.app and you can select Use this copy. With Use another copy… you can find and select OS X Install app
Step 7. Select USB key.
Step 8. Select Erase then create the disk . All content on USB key will be erased!
Step 9. Insert your password when prompted
Step 10. Wait until is finished and Quit app
USB key is now bootable and ready to be used for fresh install
https://www.youtube.com/watch?v=cmgMqMrzKjs
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