this post was submitted on 15 May 2024
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If every time an OS had to delete something it had to fill the space with zeros or garbage data multiple times just to make extra sure it's gone, we'd all be trashing our flash chips very fast, and performance would be heavily degraded. There really isn't a way around this.
The solution to keep private files private is to put them into an encrypted container of some sort where you control the keys.
Step away from hardware constraints for a moment, and consider the OS:
If the OS says a file is deleted, under no circumstances should the OS be able to recover it. Sure, certain tools may exist to pull it back; but it should be unavailable to the OS after that. And yet, apparently a software update was enough to recover these files. Thus, the concerns about data safety in an environment where the OS cannot be trusted to remove data when it says it has been removed.
So let's stop calling it "deleted" then, and call it what it is. "Forgetting".
I'm not sure what you actually want the OS to do about it other than as I said, fill it with random data.
Well, iOS could just do it like every other OS that don't restore deleted data by installing an update.