Two packs. One seems to work. The other is corrupt from the start. Then I plugged tablets into Fire HD 8. One of them keeps getting error messages that the disk cannot be read. Works temporarily after formatting, then again with errors. I have at least 12 Samsung Micro SD cards and have never had a problem. I was trying to save a few bucks for my kid's tablet and gotten an unfamiliar brand. No, it doesn't work at all.
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