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    (n.) The mechanism that reads data from or writes data to a magnetic disk or tape. If the head becomes dirty, it will not work properly. This is one of the first things to check if your disk drive or tape drivebegins to malfunction.

    The head is sometimes called a read/write head. Double-sided floppy disk drives have two heads, one for each side of the disk. Hard disk drives have many heads, usually two for each platter.

    Also see What’s Inside a Hard Drive? in the Did You Know . . . ?section of Webopedia.