The Windows tool you're told never to use on SSDs has a secret

If you've had an SSD for a while, you've probably heard the same warning a hundred times: never, under any circumstances, defragment it. Don't just do it. And if you're curious why, they'll give you the classic rundown: SSDs lack the spinning platters and mechanical read heads of old-school hard drives. Rearranging scattered files gives an SSD none of the seek-time benefit it gives a hard drive, while adding unnecessary writes to the flash memory.

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