And this over-provisioning is much more significant that the difference between 1GB and 1GiB, in fact, the ability to use low-grade flash wafers is why the flash storage is so cheap. SanDisk microSD Product Manual tells it's an intrinsic function in their products. If you're still unsatisfied by this technique because there's a small probability that (a) a meaningful chunk of data survives and (b) the adversary will be able to read it out and (c) decrypt it, consider that physical destruction may not destroy the data definitely: there will be a chance that one night you will sleepwalk to a potential adversary and sleeptalk the data to them.Įdit addressing some of the comments: consumer-grade flash storage does have over-provisioning, e.g.
Next time you're about to put sensitive data on a flash drive, consider encrypting it first! Strongly encrypted data is useless without the key, and if you securely erase the drive first, all that will be left is an occasional sector of such encrypted data surviving due to wear leveling.
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