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That may work if you are covering up possession of illegal downloads or something similar.

But if you are protecting your privacy (personal documents etc.) or your companies privacy (source code, plans, etc.) then you've still lost.

The deletion password would work, as long as they don't image the drive first and use your software to decrypt.

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The only way is to physically destroy the hard disk, like making confetti with it. For example, it's very hard to destroy data saved on SSD drives (last time I heard)

There's a clever way to destroy data on SSD: just overwrite your (encrypted) hard drive encryption key, then even though the data remains, the key is lost forever. I think most modern SSDs come with the feature.

More info in this question: https://superuser.com/questions/986387/why-does-my-ssd-inter...

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