With process sizes where they are today, there's basically going to be nothing remaining after one erase + program. Raw flash today is already struggling to hold the contents of one write cycle as it is, never mind remaneance from several...
But if you wrote sensitive data to a block that then went bad, then there's a good chance that a large fraction of your data is there and will never be erased, not matter what high-level commands you send the card.
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With process sizes where they are today, there's basically going to be nothing remaining after one erase + program. Raw flash today is already struggling to hold the contents of one write cycle as it is, never mind remaneance from several...
But if you wrote sensitive data to a block that then went bad, then there's a good chance that a large fraction of your data is there and will never be erased, not matter what high-level commands you send the card.