Defrag

Keith Nuttle wrote:
On 3/6/2018 2:50 AM, Martin Edwards wrote:
And yes, SSDs don't need to be defragmented. Trim is defragmenting, it is
preparing currently unused sectors to be used again.
For my information and understanding, please explain why.

Is it the dynamic nature of the SSD formate, ie the information is
constantly changing to fill the gaps??

The seek time on an SSD is "zero". It doesn't matter
where the fragments are stored. That's the basic premise
behind the "doesn't need defragmentation" claim. An SSD doesn't
have nearly the overhead of a mechanical disk.

However, fragmented files need more $MFT space to store
the addresses. Eventually, you can reach a state (when
storing a 60GB file on a compressed partition), where the
$MFT can no longer represent the file fragments properly.

There are other failure modes, mentioned here. This
explains why Microsoft is still (occasionally) defragmenting
SSDs.

https://www.hanselman.com/blog/TheRe...YourSS D.aspx

Paul