Sandisk cards are utter/total garbage. Just the amount/quantity of problems reported in this thread alone should convince anybody who was on the fence before about a purchase of this crap.
Unfortunately, I have three of them that I bought when the 64gig cards first came out & the Sandisk brand where all that was available at the time (my employer paid for them or I would REALLY be pissed).
I have now had four Sandisk cards replaced under warranty (same problems as all the other posters where reporting). I still use them, & keep them backed up religiously but I would definitely not buy another one at this point.
Of course in any thread like this, there will always be the occasional poster that claims "I have had my card for years & never had any problem whatever with it, you posters having problems are all idiots". Clearly not every single card is defective but Sandisk has FAR FAR too many defective ones per hundred/whatever compared to any other brand.
Since I am the head of the IT dept where I work, all our defective stuff runs through me & I cringe anytime a user comes to me saying I have 9 gigs of music files on my 64 gig card and the card is saying it is "unreadable" for some reason. If we are on the phone, the first question I ask is "is the card red & gray??" (already knowing that it will be).
I have wasted more time running disc recovery apps for users trying to recover all their bootleg music files when I know right up front it will probably be a complete waste of time.............
VZ Note 2, Titanium Gray,
unlocked with Beans V2 ROM, Perseus Kernel 200-1800,
Nova Prime launcher, Digital Soul Icons
Red theme by Icedventimocha
Samsung ATIV Tablet with Windows 8 Pro
64 gig plus Sandisk (junk) 64 gig MicroSD
Lol, I feel sorry for the pathetic posters who beg everybody to thank them in their signatures.....