Disk Hardware. Arm can move in and out Read / write head can access a ring of data as the disk rotates Disk consists of one or more platters Each platter is divided into rings of data, called tracks , and each track is divided into sectors
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Diagram from Advanced Programming in the UNIX Environment, W. Richard Stevens, Addison Wesley, 1992.
(Think about how this compares to Windows or to the Macintosh OS)