Storage organization of hard disk | Hard Disk Drive Basics

       STORAGE  ORGANIZATION  OF  HARD  DISKS

           INFORMATION  IS STORED  IN THE  FROM  OF MAGNETIC  PATTERN  BY USING   A CIRCULAR,  FLAT  PLATTERS.  THESE  PLATTERS  ARE MADE  OF EITHER  GLASS  OR METALS  COATED  WITH  A SPECIAL  MATERIAL  ON BOT SIDES. INFORMATION  IS STOGERD IN THE  TRACK  AE TURN  DIVIDE  INTO  SMALL  SECTORS.  THE ROTATION  OF PLATTER  IS DONE  A  SPINDLE  MOTOR  THAT  IS CONNECTED  TO THE SPINDLE MOUNTED  ON THE PLATTERS.

           

        OPERATION IS CARRIED  OUT BY  USING  A SPECIAL  ELECTROMAGNETIC  DEVICES  PRESENT  ON THE  SLIDERS,  WHICH  IS  MOUNTED  INTO  A  ACTUATOR  ARMS.  THESE ARMS  ARE CONNECTED  INTO SINGLE  ASSEMBLY  AND PLACED  ON THE DISK  SURFACE.   THE POSITIONING  OF THE ARMS  IS DONE  BY A DEVICE  CALLED ACTUATOR.

             

         

         WRITE  A OPRACTION  IS CARRIED  OUT  IN THE  SAME  WAY  AS DONE IN THE FLOPPY  DISK.  THE DISK  SURFACE  CONSISTS OF ARRAY  OF MAGNETIZED  AND DEMAGNETIZED  DOTS.  BINARY  1  IS USED TO REPRESENT  MANGENTIZED  DOT  AND BINARY 0  IS USED TO REPRESENT  DEMANGMESTION  DOT.  IN ORDER  TO READ  DATA FOR DISK, VIRTUAL  FILE ALLOCATION  TABLE  OR  FILE  ALLOCATION  TABLE  IS INITIALLY  READ  DATA OINTLO  WINDOWS  OPERATING   SYSTEM,  WHEN  THE HARD   DISK  IS BEING  PARTITIONED.

        IN HARD DISK  HEAR DOES NOT COME  IN CONTACT  WITH  DISK  SURFACE.  THE DISTANCE  BETWEEN    HARD  AND THE DISK  SURFACE  IS EQUAL  TO  THICKNESS OF  HUMAN  HAIR.  IN CAES, IF THE CHANGES  OF A HAED CRASH, MANY DISK  CONTROLLERS PLACE  THE HEAD INTO  A TRACK  WHICH  IS UNUSED

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