To make a bootable usb unbootable using command prompt
Open Command prompt
Type diskpart and press enter
Type List disk and press enter
Type select disk N(N is your disk number starts from 0) and press enter
Type clean and press enter
Type create partition primary and press enter
Type format fs=fat32 quick and press enter(wait for few seconds until the format process reaches 100 percent)
Type exit and press enter
This is one of the method to unboot the bootble USB using cmd. Hope it will help you.
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