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Originally Posted by BookCat
The usb must be ok because I can write to the reader's internal memory.
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I've seen lots of problem USB ports where one device works and another doesn't.
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Calibre refused to write the book to the card.
I phoned a techyish friend who suggested trying to create a new folder within the card's drive, but I was given the message that it was "unable to create the folder "new folder", the directory or file can not be created."
The card has MASSES of space left.
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These are very typical symptoms for USB problems. Alternatively, the SD card itself may be bad. I'd try very hard to check both out.