USB flash drive consists of a smallprinted circuit boardcarrying the circuit elements
and a USB connector insulated electrically and protected inside a plastic, metal, or rubberized case which can be carried in a pocket. The USB connector may be protected by a removable cap or by retracting into the body of the drive, although it is not likely to be damaged if unprotected through a case. Almost many flash drives use a standardtype-A USB connectionallowing plugging into a port on a personal computer. Some drives for other interfaces are also available. These USB flash drives derive their power from the USB connection and do not require a battery while some devices which combine the functionality of adigital audio playerwith flash-drive-type storage require battery.
USB flash driveconsists offlash memorydata storage deviceintegrated with a USB1.1or2.0interfaces and are typically removable and rewritable. USB drives are much smaller than a floppy disk. It is light weight almost 30 g which is lesser than a floppy disk. It can storeup to 256 GB. There are different capacities Flash drives like 4 GB USB drive, 8GB USB drive, and 128 USB drive GB etc. 8GB USB drive is double of 4 GB USB drive.
This 8GB USB drive is small and portable flash memory card plugs into computers USB port and functions as a hard drive but is easy to use because of its small size which can even be carried into a pocket and can be plugged into any computer. It has less storage capacity than hard drive but is smaller and more durable. 8GB USB drive of Kingston is available in the market at 19 US Dollars.