I voted for four, I hope that's ok! I do all four equally as often. I sync with the cable to Calibre, I use the USB and drag and drop in Windows Explorer, I use just the SD card and sync with Calibre, and I also just plug in the SD card and drag and drop in Windows Explorer. I've never had any difficulties when using the USB cable, but I have had troubles just inserting the SD card and doing it that way. Not always, but sometimes my computer won't read the SD card. But it always works with the cable.
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