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...
Total fragmentation = 9 %
File fragmentation = 19 %
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?