The full name of the U disc, USB flash disk, English name "USB flash disk". It is a USB interface without physical drive of the micro high capacity mobile storage products, can be connected to the computer through the USB interface, plug and play.

U disk name originated from the Netac Co production of a new storage device, dubbed the "USB connection", using the USB interface. USB interface to the host computer, U disk data can be exchanged with the computer. After the production of similar technology and equipment because Netac has patent registration, and could not be called "flash", and renamed the U disk "homophonic".