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PAUSE

If they want to quit, do so

PAGETURNER

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    <<<<<< 4 BOTTOM LINES CLEANING SUBROUTINE >>>>>>

ENCORE5

    <<<<<< REVIEW CLEANING SUBROUTINE >>>>>>

ENCORE

    <<<<<< CLEAN THE INSIDE OF BOUNDED ARE ONLY >>>>>

BOX

                       ILLUSTRATION                     

GO

  The file system under UNIX may be visualized on the 3 different levels:

  1. The actual physical disk with arbitrary sized sectoring

     Physical Disk       

       Arbitrary

       Sized    

       Sectoring

  2. The physical disk may be divided into several logical disks or 

 Logical Disk

      ------

       File

      System

        1

      ------

       File

      System

        2

      ------

        ::

        ::

  3. The file system itself is made up of N blocks.  The 0th block is the

  boot block, which is not repeated on the system, block 1 is the 

  superblock, blocks 2 through X hold the inodes, blocks X+1 to 

  N-1 hold the files and free blocks.

 File System N Blocks

 0            Block 0

            Superblock

 2           

  INODES   

 X            

X+1          

   Files   

    and    

    Free   

N-1  Blocks