Amazon.com: Professional Ultra SanDisk 64GB MicroSDXC Card for Samsung Galaxy S4 Active Smartphone is custom formatted for high speed, lossless recording! Includes Standard SD Adapter. (UHS-1 Class 10 Certified 30MB/sec) : Electronics
Samsung Galaxy S4 Camera can't save pictures to SD card, remove microSD card write-protection, other memory issues – The Droid Guy