Before disconnecting the usb cable you should properly "eject" the Reader from the computer. If using the Sony software, you will see a small eject icon appear when you mouse over the Reader in the left-hand pane. If using Calibre, the eject icon will appear when you mouse over the Reader along the top. If no software is open you should still have to eject the device from Windows/Mac and the process may vary depending on you OS.
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