?A USB flash drive is a NAND type flash memory. The NAND type flash memory was designed for the exchange and saving of data as alternative to the magnetic disk. The NAND type flash memory has the capacity to hold large volumes of data. The writing and erasing speed is also fast. On the other hand the random access is rather slow because it uses block as a unit for the purpose of writing and reading. The USB drive is made up of secure case small circuit board and is integrated with a universal serial bus connector. The secure case is typically made up of rubber or metal. This secure case protects the circuit board of the USB drive from damage and increases the robustness. The USB drives are very much smaller than the floppy disks and are rewritable. The USB drive can be easily inserted into the USB port of the computer. With the help of USB flash drive, data can be safely and easily transferred. The USB drive is more reliable and safer than the floppy disks. The USB drives are small and compact, therefore the users can carry them easily in their pockets or they can attach it with their key chains as well. The USB drives are more reliable when huge amounts of data has to be moved. Some of the USB drives allow 1 million erase or write cycles. The USB Memory card readers have a removable flash memory card. The USB flash drives provide more benefits to its users than the other storage devices. Almost all the computers and laptops have the USB ports, therefore the users can easily transfer the data. Most of the modern operating systems have the USB mass storage standard which is required by the USB flash drives to operate. The USB 2.0 are much faster than the optical disk in terms of the data storage in much smaller space. The name "drive" is given to the USB flash drive because the USB flash appears to the OS of the computer like a mechanical drive and the method of access is also the same. The USB connector must be protected and kept safe using a removable cap or by retracting the USB connector into the body of the USB flash drive.The USB flash drives use all the power supply from the host connection. Some high speed USB drives may require more power supply than provided by the bus powered USB hub. Therefore these drives will function when they are directly plugged into the self powered hub or the host controller. The USB drives are most often composed of three components, the male connector type A, crystal oscillator and the USB mass storage controller. The function of the type A connector is to interface with the system of the host computer. While on the other hand the USB mass storage controller helps in balancing and storage of the data. The USB mass storage controller enhances and carries out smooth processing of the decoding, encryption and transfer of the data between the systems. The function of the crystal oscillator is to make sure that the out put of the flash drive is of the best quality. The reason that the USB drives became more popular is that the floppy drives were most of the time failed to read the data from the floppy disk. Therefore, the users had problems while transferring the data using the floppy disks. The USB flash drives do not have movable parts like the floppy disks had.
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