Magnetic Hard Disk Mechanism track t spindle arm assembly sector s、 cylinder c-→l read-write head platter arm rotation NOTE:Diagram is schematic,and simplifies the structure of actual disk drives Database System Concepts-6th Edition 10.11 ©Silberschat乜，Korth and SudarshanDatabase System Concepts - 6 10.11 ©Silberschatz, Korth and Sudarshan th Edition Magnetic Hard Disk Mechanism NOTE: Diagram is schematic, and simplifies the structure of actual disk drives