T. Brown "TB"
Maybe there is nothing that can be done and it is just the way the technology is at this time, but to me it seems that the 64GB SD cards have very limited uses at this time because they are formatted in whats called "exFAT32" instead of the standard FAT32 to get 64GB from a 32GB card.  After receiving my card and inserting it into my new android tablet with, Jelly Bean, it was recognized and it did show I had 59GB available.  I then removed the card from the tablet and inserted it into my computers, a Win7 and a Vista, and tried to transfer files, photos and videos from my laptop to the card they WOULD NOT TRANSFER!  After some research on the internet it appeared that the card had to be reformatted from the new "exFAT32" to the standard FAT32.  All my files were created in Win XP and Win Vista - FAT32.  I also have a Win7 machine I recently purchased and can easily move all types of files between all the machines and memory cards and flash drives but could not transfer any files to this card from any computer as long as the card was formatted in exFAT32.  I had read on the internet about reformatting  the cards and it working.  My Win7 machine does not even have the option to format to standard FAT32, it only has NSTF and exFAT32.  My older computers have the older FAT32 format option and it took my Vista computer with a Dual Core processor 1  hours to reformat the card to FAT32.  After reformatting I was able to easily transfer my files, photos, and videos on my XP and Vista computers BUT not the Win7 computer.  The card works in my tablet and I am able to access and use all the files I transferred to the card in FAT32 with my Vista computer on the tablet.  BUT after reformatting it now the card only has 27GB of space available, so it was essentially reformatted the 64GB card into a 32GB card.  I will keep the card because I have a lot of work into it reformatting and transferring files and hopefully in the future I can reformat it again back to exFAT32 if and when exFAT32 catches on and an OS is made that can seamlessly use files created in both FAT32 and exFAT32.  This seems to be a good card that works well in certain situations but my advice do your research on what you have and how you will use the card because this is not simply a big GB card that can be used for everything in every device, unless ALL your files, photos, and videos are in, or will be created with, exFAT32 there are some real draw backs to this card and you might be better off just buying multiple lower GB cards if you really need this much storage space in a Micro SD card.  Or perhaps cards you already own can be reformatted into exFAT32 and double the capacity if your computer has the exFAT32 reformat option.  I have not tried it but based on my experience the last few days it seems like it would work if exFAT32 works for you. I gave 3 stars because it does work, but I feel Sandisk not fully explaining how they are getting 64GB out of this card and the possible problems a consumer might have with it is misleading advertising.