Writing random bits is more or less guaranteed to work on the bulk of the data. There are small caveats with caches, degraded cells, and other degradation manag

Writing random bits is more or less guaranteed to work on the bulk of the data. There are small caveats with caches, degraded cells, and other degradation management mechanisms, but I would be quite surprised if anything can be extracted; the chance of have a critical piece of data remain recoverable (at great effort) should be insignificant for most applications. I do wish manufacturers would make a 'wipe all memory and caches' command, but it's not exactly in their interest to ease resale of used hardware... (it could be pitched as increased customer value). This whole destruction thing is very economically and environmentally nonsensical to me.