Sd card not working

[E. W. 00330]

I’m using an external card reader and when I plug in one sd card, it works. My computer even brings up it location in file explorer. But then when I try to plug in another sd card, nothing. I even tried using both sd cards in a computer that has its own sd card slot and again only the 1st sd card works. The 1st sd card came with one of my computers, I think, and the 2nd is a brand new one that I just got.

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