A USB flash drive is a storage device used for data backup.  It comes with an incorporated Universal Serial Bus interface along with flash memory. The data stored on the disk can be removed, reused and is re-writable. It can be used on any device that has a USB port. It is quite a versatile storage device. The flash drive comes with a USB connector that is well-protected and insulated electrically inside a rubber case. There is a small printed circuit board that has integrated circuits mounted on the surface inside the casing. These flash drives come in different specifications. Specifications of a flash drive are: A. USB 1.0 (low-speed): This type of flash drive can transfer data at a speed of 1.5 megabits per second (Mbps). B. USB 1.0 (high-speed): This flash drive transfers data at 12 Mbps. C. USB 2.0: This flash drive is also called the Hi-Speed USB. This flash drive transfers data at 480 Mbps. D. USB 3.0.: This is also called the Super Speed USB, and it was launched back in 2008. It transfers data at a rate of 5 Gigabits per second. E. USB 4.0: It is expected to be released later in the year, and it will have an even high transfer rate. This makes it quite a reliable storage device especially when one needs to transfer some files.