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Sandisk cards for domestic sale in China have 18-digit authenticity code on scratchpad, and you can verify it online at verify.sandisk.cn.

So, "buy in China because there's too many fakes in US store". Ironic isn't it.

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I came here to say the same. :) I can attest that this works. I've checked these codes on several cards along with speed and full rewrite/compare tests, to verify capacity and A1 rating.

Never had an issue.

I've checked a couple of fake Sundisk cards from Aliexpress as well, detected as fake as they should.

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