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Is it needed/beneficial to defrag SSDs?

Is defrag part of wear levelling?
Does defrag work but due to extremely low access/seek times, it does'n provide a noticeble speed increase (but uses up TBW)?

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Yeah, no, it's not needed, and may actually reduce the longevity.

The main reason to defrag files on a hard drive, is so that the data is more sequential.  This means less travel for the read heads in the drive. Which means faster access times. 

Since an SSD is all NAND flash, it's all pretty fast. 

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