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[Win2000]  Defrag Results

CE101 asked
Last Modified: 2012-05-08
OS:    Windows 2000 Professional, SPK 4

I need some help understanding the results I get from the Windows Defrag program.

I recently ran the Defragger on my Western Digital 500GB "My Passport" portable usb harddrives (Model:  WDMER5000TN).
After the first 4 hours there was a dramatic difference between the before and after progress bars.
However after that  there was not much change.
I ran it for another 8 hours (for a total of 12 hours) and then cancelled the program.

QUESTION about duration:
Is it true that the most signficant results are achieved in the first few hours (assuming a 500GB drive) and after that the results are neglible ?
I have found this to be the case on my internal drives as well.

Now back to the results...
By the time I cancelled after 12 hours, I had reduced the following
    Total fragmentation            from 23%  to  9%
    File fragmentation              from 46%  to 19%
    Total fragmented files        from 26,667    to  16,158
    Total excess fragments      from 288,806  to 136,540

You can see the full before and after results in the attached file named  Defrag-Results.xls
You can also see before and after screenshots in the attached file named  Defrag-Results.jpg

The JPG contains two images..
(1)   (A) Analysis Display   (B) Defragmentation Display
(2) Analysis Display
#2 was run immediately after completion of #1.

QUESTION about display...
Why is #2 different that #1B ?
Where did all the blue stuff (representing continguous files) at the right side of #2 come from?
Perhaps #1B doesnt show the blue because I cancelled the program prematurely ???

QUESTION about the results (see the attached XLS file).
The after-results show...
    Volume fragmentation
        Total fragmentation                        = 9 %
        File fragmentation                          = 19 %
    File fragmentation
        Total files                                      = 837,597
        Total fragmented files                    = 16,158

I don't understand the 9% and 19% figures.
If you divide  16,158  by  837,597  you get 1.9%.

Just to recap, here are my questions again...
(1) Is it true that the most signficant results are achieved in the first few hours (assuming a 500GB drive) and after that the results are neglible ?
(2) Why are the "Defragmentation Display" and the subsequent "Analysis Display" not the same?  
(3) How is the File Fragmentation Percentage calculated?  

Any suggestions would be greatly appreciated.


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