There I was thinking I had this all clear in my head and now I'm confused all over again. James, your recent posts seems to contradict what Szadzik has said in reply to me - that the card you purchased should work 'as is' in your tab. So perhaps I should ask the question again, as clear as I can make it: If I buy a 64GB microsdhc or 64Gb microsdxc card and plug it directly in a galaxy note 10.1, will it be recognised and work correctly without any formatting or playing around (on the tab itself or on a seperate PC)? Szadzik has said 'yes' but your experience suggests 'no'. The fact that you're having to play around with formatting using a PC and card reader is a distraction - the 64Gb card should either work in the tab straight off or it shouldn't - which is it? Thanks for any help.