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  1. 1. Defragmentation 1
  2. 2. Disk Defragmentation 2
  3. 3. Definition Defragmentation is a technique that puts all related data together pertaining to a file In order to speed up accessing, the free space is consolidated in one contiguous black That is free contiguous memory locations are available to store future data 3
  4. 4. Example A group of students along with their teacher go to a concert if they reserve seats early then they sit together in the same row Accessing them by the teacher is fast and easy Other wise they have to take whatever sets are still available scattered about the auditorium Then accessing them by the teacher is difficult 4
  5. 5. Contd.. Example If scattered the group can be defragmented by rearranging the seats such that all students take seats together This is called Defragmentation 5
  6. 6. DefragmentationWhenever we delete a file from our hard disk andwhenever windows removes a temporary file, a storagearea on the disk becomes free for reuse again the next time we save a file, windows uses its freearea to store as much of the file as fit 6
  7. 7. Defragmentation As we delete old files and insert new files over a periodof time, they begin to be distributed on the hard disk as apiece here, piece there, another piece somewhere else 7
  8. 8. Defragmentation It tends to slow file accessing because the system has to go to several locations to pick up onefile 8
  9. 9. Advantages We can speed up the hard disk response time byrunning the Disk Defragmenter programThis program rearranges the files so that all parts of afile are stored together in one location 9
  10. 10. Advantages Contd.. Large sections of free space are also put together So we can improve the performance of our computer by defragmenting our hard disk 10
  11. 11. Procedure for Defragment Click the Start button Point to programsPoint to AccessoriesGo to System Toolsand click Disk Defragmenter 11
  12. 12. Procedure for Defragmenting 12
  13. 13. Defragmentation 13
  14. 14. Defragmentation 14
  15. 15. Defragmentation Select the Drive Click OK to start the defragmentation The decrementing Drive window appears as shown 15
  16. 16. Defragmentation 16
  17. 17. Contd.. Defragmentation Defragmenter starts to defrayment files on the selected drive and displays its progress We can choose to stop it, pause it or show details to seeDisk Defragmenter in action 17
  18. 18. Contd.. Defragmentation A dialog box appears when the defragmentation of the hard disk is complete Click Yes to close Disk Defragmenter 18
  19. 19. Summary In this lecture you have learned about Defragmentation Advantages of defragmentation Method to defragment 19
  20. 20. Frequently asked questions1.What is meant by defragmemtation? What is the need of defragmentation ?2. Why would you need to defragmentation your hard disk?3. What are the advantages of defragmentation? 20
  21. 21. Quiz1. A technique that puts all related date together (a) fragmentation (b) defragmentation (c) delete & save 21
  22. 22. Quiz2. After defragmentation the accessing becomes (a) slow (b) same (c) fast 22