Deleting information from a hard drive doesn’t actually erase it. When you delete a file, the file is still there. You’ve merely removed it from the disk directory—the system that tracks all the files and where they’re located—and marked the space the file occupies as free for use.
What damages an SSD is writing information to it. Every time you record information to an SSD, you damage it. The memory cells in an SSD have a limited, and surprisingly short, life expectancy. They can only be written to a certain number of times before they stop being able to retain information. Each write wears them.
So it’s not deleting files, it’s adding files (or modifying files), that causes the damage
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