A USB drive is a plug and play storage device. It uses flash memory and is very lightweight. It can be used in place of a CD or a zip drive disk. It is recognized as a removable drive by computer. Custom USB Flash drives does not require rebooting after it ' s attached, does not require batteries or an external power supply, and is not platform dependent.
With a USB drive, data can be retained for long periods when the device is unplugged from the computer, or when the computer is powered - down with the drive left in. It is very convenient to transfer data with the use of USB.
Their capacity ranges from 256MB, 512MB, 1GB, 2GB and 4GB and there are many forms of USB drives available in the market.
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