Thanks, Helf. I did read that post when first published and thought it wonderfully informative. I haven't yet bought any mSD cards larger than 32GB, but I did buy a 64GB USB flash drive the other day (it was on sale a great price)!
It does not work with my PE, however. I get an error message that the drive is 'damaged' and needs to be formatted.
It's 'exFAT' or something, so I need to look up the difference between that and FAT32, I guess.