Quote:
Originally Posted by anamardoll
Oh, thank you. That won't cause problems with abruptly cutting off communication with a device/card? 
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Windows won't complete the Quit until it can do it gracefully.
Of coarse, that can cause problems when the problem won't end

Try and see what you get. At worst, you corrupt a file system.
Killing Calibre should never Physically damage the SDcard the Device is a HW buffer in between.
(Yanking the card is not supposed to... but I would pull the USB cable first. then power down the reader/device)