Turn on both the ST-16 and the H... once the camera comes up with the SD card recognized, go into camera settings... one of the menu options is to format SD card.
Well, it was worth a try! I did as you suggested, but when I tapped on "reformat SD Card" it said "Card not detected" and the green light on the camera kept blinking on and off. I'll try testing another card just to make sure the formatting works or not. My 32gb Class 10 card works just fine so no big deal here. Thanks for your help.