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#21
How do I check how it behaves? I clicked on "Analyse", and it said "OK" as shown in my screenshot.
Observation.
In Matthew's case, a 2% fragmentation level is acceptable so the Command/Powershell analyze returns "No need to defrag".
That's reasonable. The level may be higher, I do not know the cap value.
A perfectly defragged HDD volume in a perfect world would start to become slightly fragmented as soon as you use it. Rewrites alone would do it. So a small level of fragmentation is acceptable.
The GUI does not let you do anything that may be harmful and/or pointless, such as defraging an SSD. It only allows you to perform the appropriate actions.
However, from the command line (Command prompt or Powershell) there are no such restrictions. If you really want to defragment an SSD then the command line will let you. If you have the GUI open at the same time it will show the progress.
PowerShell Optimize-Volume -DriveLetter C -ReTrim -Verbose
Elevated Command Prompt let me run the above although C is an HDD.
I closed the window immediately.