My favorite was tests results of multi-pass overwriting software against SSDs. The controller would see multiple writes to the same location/block in the queue and then only apply the last one. Effectively making the multi pass overwrite to be just one pass https://t.co/6nBGByJyLG

— Andrew Case (@attrc) November 5, 2019

Aye. Multi-pass overwrite DOES NOT work on SSDs. This is why the DoD and other high-security places mandate SSDs be destroyed if they contained top secret or secret data, as they cannot be re-used. The data on an SSD is impossible to delete reliably. Even vendors who claim to have a secure delete capability probably don’t.