A USB Drive is the only device or component that can be used as a boot device. DDR2 is a type of Random Access Memory (RAM). HDMI (High-Definition Multimedia Interface) is audio/video interface. FDISK is a command on some operating systems that provides disk partitioning functions - but it is not a storage device as requested by the question.
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What is a USB Drive and how does it work as a boot device?
What are the differences between FDISK and a bootable USB Drive?
What is DDR2 and what role does it play in a computer?