Why doesn't the USB flash drive appear when pressing option on Mac?

Why does Mac not display the USB flash drive when pressing option

Generally, the USB flash drive is not inserted properly, or the USB flash drive is broken. Even if the USB disk is in win system format, it will still be read. Therefore, it can only be a USB disk problem or an interface problem.

When you insert a USB flash drive and turn on the computer, press and hold the power option key to select it to boot. That is, when the computer is turned off, press and hold the power option key to turn on the computer. Release it until the screen for selecting startup items appears. Use the mouse or keyboard to select startup. . Generally, you can reinstall the system.

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