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I don't know about earlier Windows, but Windows 8 does not attempt to defragment drives that identify themselves as being solid-state. It does invoke TRIM on drives that advertise that feature, and confusingly, this is done through the same defragmentation UI.

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Why 'confusingly'? It's only natural to keep drive maintenance in one place. You don't ever need to invoke defrag/trim manually as they are scheduled to run whenever PC is not in use.

It's confusing to people who are told to disable defragmentation on SSDs. It's the same button for both HDDs and SSDs, and both TRIM and defragmentation are referred to using the same word, 'optimization'[0]. An unaware user would not know the difference.

[0] http://www.oszone.net/user_img/vadblog/ssd-defrag-bug-en01_m...

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