I heard on the internet that defragmenting an SSD is quite harmful. I was wondering if it is true, and if so, why? I've already done it a few times and it didn't seems to be broken at all.
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6This has been answered in a previous post - http://superuser.com/questions/1594/why-cant-you-defragment-solid-state-drives – Mike Diglio Dec 05 '15 at 01:31
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it is not bad all times: http://superuser.com/a/1009410/174557 – magicandre1981 Dec 05 '15 at 08:26
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Unlike platter drives, SSD drives can only be written to a set number of times. By defragmenting you are shortening your drive's lifespan for very little gain.
Fragmented files don't affect the speed of a SSD drive in any noticeable way so there is no reason to defragment.
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The last part of this answer is not true any more. Modern SSDs often hit their I/O per second (IOPS) limit before they hit their bandwidth limit. The more fragments a file is in, other things being equal, the more I/Os it will take to read it. – David Schwartz Dec 05 '16 at 04:57