As per other's instructions, I inserted it in a powered-off phone and let the phone format it (automatic, after a yes/no dialog). I removed it from the phone and copied  my old card onto it through a card reader on the PC (plus about 20 movies) and everything is working perfectly. Speeds seem outstanding; certainly, copying a 3GB HD movie I copied from my Blu-Ray disc took only a few minutes, even over USB 2.0.