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3I can't say I'm educated in this area, but I believe it is because SSDs are damaged slightly every time they perform a write, and defragmenting wears out the SSD faster. Also, since SSDs have no moving parts, defragmenting SSDs gives a smaller performance gain than defragmenting HDDs.– BlixtCommented Jul 15, 2009 at 13:33
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1Note to readers landing on this page: thinking on this subject has changed in the 7 1/2 years since this question was asked. Please be sure to see the recent answers here and the answers on the current question this is marked as a duplicate of.– fixer1234Commented Dec 1, 2016 at 16:20
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