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But can it bypass the magic performed by the SSD controller?

In particular, can it be certain that a flush is really a flush?

If the disk decides to falsely report a flush, there's not much you can do about it from the user side, no?

Related: Could it be of any use in easily detecting counterfeit SSDs, which have been hacked to report a fraudulent size?

Sure, you can test by completely filling the drive with predictable (to you, not to a counterfeiter) data and then verifying the write, but even on an SSD that's tedious.

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