I don't notice differences in speed, but sometimes when I connect the T1 to my Mac the SD card is not recognized by Calibre, making it impossible to send books to the card. I don't know if the issue is with Calibre or the Mac not mounting the card. I'm not sure how to force it to do so. When this happens, I send the next 5 books in my reading queue to internal memory and then move them to the card the next time I can access it. The T1 can always read the card.
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