USB drives come in a variety of styles and sizes. They give you the ability to expand the capacity of your computer to store additional files, backup existing files or transfer files easily between computers. Smaller drives are powered exclusively by the USB port, but some require an external power adapter to function. Many use solid state technology, such as jump drives, while others are external magnetic hard drives. One of the greatest benefits of USB drives is that they are completely plug and play. They do not require an additional driver installation, unless you are using an unsupported operating system, such as older versions of Windows and certain Linux distributions. Reading the Drive While the storage method of the drives may vary, your computer uses the same process to retrieve data from all USB drives. When you plug in your USB drive, the driver that supports it instructs the USB port to query the drive. This sends a command to the drive to perform a read request. The file system, or the layout of the files on the drive, is read and returned to the computer through the USB port. The driver interprets this information and forwards it to the rest of the computer for use by programs. Retrieving Data When you open a specific file, the same read process is initiated. All hard drives are sectioned into memory locations for file retrieval. Since the computer already knows the layout of the USB drive, the program can send the specific file location to the USB port. The port then requests that location from the USB drive, which performs another read request and returns the contents of the file in binary, a series of 1s and 0s which represents the file's contents. The binary data is returned to the USB port, interpreted by the driver and sent to the program for output on your screen. Writing a File The process for writing data is very similar to the process for reading data. Rather than sending a request for a certain location, the program that is writing the file will convert it to binary. This binary data is then sent to the USB port, which forwards it to the drive to be written. Once the file has been written, your computer will request a new copy of the drive's layout so it can access the new or edited file in the future.
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