It is actually a USB flash drive.

这其实是一个优盘。

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Insert a USB flash drive into your computer.

将一个USB闪盘安装到计算机上。

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System Sweeper can boot from a USB flash drive or a CD-ROM.

“系统清理器”可以从U盘或者光盘中启动。

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The SanDisk Extreme USB flash drive provides the fast performance that these next-generation computing devices demand.

ENGADGET: SanDisk outs Extreme USB 3.0 flash drive alongside a trio of Cruzers

Announced in January, the Roku Streaming Stick is a tiny, wireless streaming player that is the size of a USB flash drive.

ENGADGET: Roku Streaming Stick ready devices will come from Insignia, Mitsubishi, Onkyo, Oppo and others

All you need is a USB flash drive with at least 1GB of free space, and the OS X Recovery Disk Assistant.

FORBES: How To Make An OS X 10.8 'Mountain Lion' Bootable USB Drive