USB flash drive
A USB flash drive is a data storage device that includes flash memory with an integrated Universal Serial Bus (USB) interface.USB flash drives are often used for the same purposes for which floppy disks or CD-ROMs were used, ie, for storage, back-up and transfer of computer files.They are smaller, faster, have thousands of times more capacity, and are more durable and reliable because they have no moving parts .Until about 2005, most desktop and laptop computers were supplied with floppy disk drives in addition to USB ports, but floppy disk drives have been abandoned due to their lower capacity compared to USB flash drives.A flash drive has no moving parts to be driven; therefore, it's not a true drive.The term drive persists because computers read and write flash drive data using the same system commands as for a mechanical disk drive , with the storage appearing to the computer operating system and user interface as just another drive.
A flash drive consists of a small printed circuit board carrying 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 or on a key chain, for example.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.Most flash drives use a standard type-A USB connection allowing connection with a port on a personal computer, but drives for other interfaces also exist.
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The basic components in a flash drive.
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