Magnetic Hard Disk Mechanism track t spindle arm assembly sector s. cylinder c read-write head platter arm rotation NOTE:Diagram is schematic,and simplifies the structure of actual disk drives Database System Concepts-5th Edition,Oct 23,2005. 11.11 @Silberschatz,Korth and SudarshanDatabase System Concepts - 5 11.11 ©Silberschatz, Korth and Sudarshan th Edition, Oct 23, 2005. Magnetic Hard Disk Mechanism NOTE: Diagram is schematic, and simplifies the structure of actual disk drives