Sd card!?!?!?

Pull down your notification bar and tap the USB Connection option, and change it to Charge Only. If you're actually trying to access what's on the SD card, (as in, through the USB Mass Storage mode) then this is normal. It dismounts the card on the phone to mount it on the computer, and it will re-mount it to the phone when you unplug the cable or change the mode to Charge Only.
 
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