While I have yet to see a dramatic difference in startup / shutdown or file access, I continue to use Defraggler. I've recent used it on my main drive, a 1TB drive, that's 50% full. As before MS Defrag said it was <1% fragmented and Defraggler said it was 37% fragmented. Took over 18 hours to run the Defraggler program but it did return and say that there was 0% fragmentation.

One of the things I particularly like about Defraggler is there is a tab that allows you to see and defrag only those files that are fragmented and not having to do the whole disk. Although I question how good it might be to defrag only fragmented files and leave the rest of the drive untouched....wouldn't this lead to less overall compaction of the drive? But perhaps drive compaction is really not the purpose of defragmentation, just a side benefit from doing a whole drive defrag.

Win11, Intel i7 7700K 4.2Ghz, 32Gb RAM, 2x1Tb HD, 500Gb NVMe, BIAB/RB 2025, MOTU 828MK3 audio, MOTU Midi Express, Yamaha Montage 7, DX7II, TX802, Motif XS Rack, Roland Fantom XR Rack, Oberheim Matrix 1000, VoiceLive3 Extreme, Kontakt 6, SampleTank 4.3