I got this for my Samsung Galaxy Tab 7.7 (p6800) and it worked great for about 3 weeks - September 18 through today, October 7.  It just died while I had the tablet attached to my PC and was copying another file onto it, so I've changed my rating from 5 stars to just 1 star.  I'd give 0 stars if I could.  Another user warned me that this had happened to him after 4 1/2 months, but 3 weeks?!?!?!?!?  I've reported this to Amazon and asked for a refund.Stay as far away from this card as you can, at least for the Galaxy Tab 7.7.UPDATE:  Amazon refunded my money for this card, and I replaced it with the Samsung equivalent, which is STILL working perfectly.  Don't waste your time and money on this card - get the Samsung.