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But this means that solid-state drives tended to slow down over time. On a full drive with bits of deleted files lying around, the process of writing to the drive is slower because each cell must first be emptied before it can be written to.

New drives come empty, so writing to them is as fast as possible. Before any data can be written to a flash memory cell, the cell must first be cleared. Because bits of deleted files are sitting around, software tools can scan the drive’s unused space and recover anything that hasn’t yet been overwritten. It’s just as fast to overwrite a used sector as it is to overwrite an empty sector. There’s no reason to empty the sectors immediately - this would just make the process of deleting a file take much, much longer. Your operating system will get around to overwriting these sectors whenever it needs more space. Instead, its data is left on the hard disk drive and marked as unimportant. When you delete a file on these traditional drives, the file isn’t actually deleted. The reason deleted files can be recovered from traditional, internal mechanical hard drives is simple. RELATED: Why Deleted Files Can Be Recovered, and How You Can Prevent It

Why You Can’t Recover Deleted Files From Internal Solid-State Drives

Accidentally deleted sandisk secure access