To make matters worse, at least from a security standpoint, even after overwriting data on an SSD, it’s possible that some of the original information is still present on the drive.
SSDs, on the other hand, can be affected poorly by the same techniques used on hard drives: overwriting data locations multiple times with random data or specific data patterns. The process of securely wiping a drive, that is, removing every bit of the data it contains and scrambling its content enough to protect the information stored on the drive from prying eyes, is fairly well understood for old-fashioned spinning hard drives.