hey what kind of SD card are you using? I cant seem to find the right one. I just went through three in my galaxy s4. A 32gb sandisk (got corrupted and went blank AFTER WORKING FOR MONTHS). A 64gb class 10 sandisk (went blank and got corrupted in a few days, after the sandisk card). Then I just bought a Samsung 64gb class 10 sd card. I opened it and put it in the S4. I went to take a picture and it wouldnt save to the sd card. So i then went to "my files" and went through the sd card. It had a bunch of foreign symbols and stuff nobody could read. SO I backed out and went to the home page. Then boom my sd card went blank and was unreadable/corrupted. I took it out immediately after turning the phone off, and was finally able to format this one back to working condition (exFAT) on the computer. (all the other ones that got corrupted couldnt be saved; i had to toss them because they wouldnt format). So i took a picture off my computer and put it on the SD card and it worked. I then took the SD card (samsung 64gb class 10) and for the first time put in my galaxy tab 3 10.1. I was able to view the picture i took off my computer. Then i took 4 videos on the tablet. They saved, i was able to view them. Then while watching the 4th video i just made, it all of a sudden said that the video couldnt be played. SO I went to the home screen, and BOOM, my SD card went blank on my tablet?! I hooked it up to my computer just now and had to re format it again. That's twice in one day between the S4 and the Galaxy tab 3. Ive been dealing with this problem for quite sometime between the two devices. They both eat my sd cards and i cant find one that works. Is the 64gb card just tooooo much for them to handle? I'm thinking of trying a samsung 32gb class 10 next? what do you guys think? Ive never had problems with a samsung 8gb card but thats just too small. I like music and can download thousands in one day.