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Windows 7: Disk Deframentation and SSD's

14 Mar 2011   #1
Microsoft MVP

Windows 7 Ult. x64
Disk Deframentation and SSD's


One of the first things I did when I installed my SSD, was to disable the Disk Defragmentation service.

However, I was browsing a link posted earlier by Bill2 in another thread, and found this interesting statement from May 2009:

Will disk defragmentation be disabled by default on SSDs?
Yes. The automatic scheduling of defragmentation will exclude partitions on devices that declare themselves as SSDs. Additionally, if the system disk has random read performance characteristics above the threshold of 8 MB/sec, then it too will be excluded. The threshold was determined by internal analysis.

Support and Q&A for Solid-State Drives - Engineering Windows 7 - Site Home - MSDN Blogs

So, my question is, if the above statement is true and disk fragmentation is automatically disabled, is there any reason to manually disable it in services? Indeed, I have seen many recommendations made here, and I have recommended it myself, to disable defragmentation for SSD's. Perhaps we don't need to?

What do you think? Was automatic disabling of deframentation of SSD's possibly not implemented, and the article is now outdated?


My System SpecsSystem Spec
14 Mar 2011   #2

Windows 7 Ultimate x64 SP1

You only need to disable the disk defragmenter scheduler if it's not already disabled by Windows after a WEI run, not the service in Services. You can disable the defragmenter service in Services, but its the scheduler that matters for the SSD. But if you do disable the Disk defragmenter Service, you won't be able to Shrink a Volume with Windows without it on.

Virtual Disk Manager

Disk Defragmenter Schedule- Turn On or Off
My System SpecsSystem Spec
14 Mar 2011   #3
Microsoft MVP

Windows 7 Ult. x64

Ahhhh....indeed, my SSD (C drive) is not listed in the Defragmentation Schedule. So that is correct : defragmentation is automatically disabled for SSD's.

Nice one - thanks Airbot.

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 Disk Deframentation and SSD's

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