can not boot osx from usb

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I try to boot osx from usb which has been made as boot disk due to my mac mini file system choas.
I press the button ‘c’/’option’ after mac running, but both cases do not trigger the menu that let me to choose boot from usb.

After the light on usb blinks 100~200 times, it stop. Then it continue to enter the procedure that recovery the file system then fail and auto shutdown.

Does anyone met the same problem?
I am not sure if usb has problem or my mac’s problem?


It may be due to wrong formatting of the USB – how was it created?

Anyway, when you start up a Mac holding down the Option key, the boot volume menu appears on the screen – this shows all bootable volumes on the screen, making it simple to boot from any volume in your Mac.

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