U disk is the abbreviation of USB disk, and USB disk is just the homophonic name of U disk. USB flash drive is a registered trademark of Netac, but everyone is used to calling flash drives USB flash drives. The flash drive (OnlyDisk) launched by Netac Company with the trademark "USB Disk" is the world's first new generation storage product based on USB interface and using flash memory (Flash Memory) media. The USB flash drive is the only original invention patented by the Chinese in the field of computer storage in China for 20 years. Its creator, Shenzhen Langke Technology Co., Ltd., is also famous at home and abroad for this reason.