
I spent the better part of three days transferring my Kindle and MP3 libraries to an external card. I was finally able to download my Kindle books, but the Amazon MP3 transfers kept dying. The error was 240 "SD card not found" or "Unable to write to SD card". I was never able to transfer more than 11GB until the card shut up and blocked my music app. At one point, the card even reset the data, and what was available before disappeared. Not worth the $50 and not worth the headache and wasted time.

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