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Never Defragment an SSD ?

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f0dder:
worstje: it's the way flash ram works. I don't claim to understand the specifics, but there's anandtech (and other) explanations... flipping bits to 0 = hard & stressful for the drive, flipping them to 1 not so much. Also, erase is done at one (large) block-size, writes are done at a smaller block-size.

I don't know if you need to use the vendors' "low-level format" tools for all drives in order to help the wear-leveling algorithms, or whether firmwares are smart enough to look at all-zero writes and do the right thing, but I'd personally use the vendor tools.

Drives with TRIM support and an OS that supports it should reduce the need for formatting-to-help-wear-leveling, but I'd still do such a pass when re-imaging a drive.

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