I bought this because I needed more storage for Asus TF700T tablet and this was the largest capacity microSD card I could find. Card came preformated with the exFAT file system which is recognized by the Asus TF700T tablet and many other Android devices. The only reason I take a star off is because I can't attain transfer speeds anywhere near the 30 MB/s that SanDisk claims (I averaged around 8 MB/s which is fine for utilizing media on the tablet, but made the initial transfer of 30GB of files onto the card a slow process).