1. AC Question's Avatar
    no apps can write to SD card, it is factory formatted to exFAT. I read thread after thread from 1.5 to 2.0 years ago all saying Android 5.0 would allow apps to access SD card. It makes no sense to me that after all this time, the latest android offered by TMobile still cannot do this. Can someone explain why this ability exists in some forms of Android and not in others?
    08-02-2016 09:10 PM
  2. B. Diddy's Avatar
    Welcome to Android Central! Are you certain the S4 can read SD cards in exFAT? I thought most Android devices require the SD card to be formatted in FAT32.

    Also, are you trying to move apps to SD, or just have them save data to the SD card? If you open the Camera app and go to its settings, are you able to change the default storage location to the SD card?
    08-03-2016 03:47 PM
  3. chichuck's Avatar
    I'm trying to write data to the card. I can only hope that if I succeed with that, the apps will be able to read that data, and also that they will be able to write to the sd card as well.

    The android central forum at this location"

    What format for sd card

    talks about formats (for galaxy S3 anyway) The phones can read either format, but each format has problems. I can't find anything that covers galaxy S4 specifically. I tried to look on Samsung websites to see what format it is supposed to read, but found nothing.

    Why is this such a difficult question to answer? Someone ought to know, especially at Samsung. But nothing. Is it bugs in the software, as if everyone has adopted the Microsoft business model of selling the product before they finish writing it? Almost makes me want to switch to Apple. At least with that, you can go to the genius bar and get some help.
    08-09-2016 09:58 PM
  4. B. Diddy's Avatar
    The SD card could be corrupt, defective, or counterfeit. Install SD Insight to see if the card is genuine or counterfeit. Counterfeit cards are programmed to report more storage than they actually have, and if you try saving more than the card can actually hold, then files can start getting corrupt.


    If it's a valid card, then go to Settings>Storage, Unmount the card, remove it, and insert it into your computer. Can the computer read these files? Backup as much as you can right now, then run chkdsk to look for bad sectors: [GUIDE] Using chkdsk to fix a corrupted SD card.

    You could also try bringing it to your local Best Buy and ask the Samsung rep there if they can help.
    08-10-2016 02:46 AM
  5. chichuck's Avatar
    B Diddy,

    SD Insight says it is an invalid card.
    My computer can read and write to the card.
    I used Windows 10 utility for disk repair and it reported that it fixed some errors.
    My old Galaxy S2 running Cyanogenmod 10.0 can read and write to the sd card as well.
    Both the S4 and the S2 reported 62.5 GB total space on the card.

    Went to Best Buy and asked the Samsung rep for help. He was a bit befuddled by the layout of the Google phone, but he kept at it. His first statement was "your card is bad." So I bought a new 64 GB Samsung card and put it into the S4. The device could read it but not write to it. Just like my invalid card. He gave me my $$ back. Then he reverted to "your phone must be bad." (Frankly, I was underwhelmed by that.) I'd believe that there is something goofy with my copy of Android 5.1 (came ota from TMobie last Oct) before I'd believe the phone was bad. The rep also erased the sd card, but could not format it because that option is not available on this phone. After erasing, unmonting, power down, he removed the sd card put it back in and booted. The sd card mounted on reboot, and it now shows 67GB total space. I queried him on what I have read on various forums: that Samsung phones have a history of trashing sd cards, his reply was that's not true, its rare and usually is operator error. I guess the internet lied to me once more. But who to believe?
    Anyway, my theory now is that maybe my ota copy of Android 5.1 is corrupted somehow. My previous experience with factory reset (different phone, not Samsung) was that factory reset does not touch the system files. So that won't help me. Anyone know if I might fix this safely by flushing system cache and maybe the delvik (sp?) cache?
    And if not, where can I find detailed instructions for how to find another copy of Android 5.1 to download and how to install it? (I will of course, check with TMobile, but I'm not expecting any help from them. So I think I'm on my own.)
    08-15-2016 09:45 PM
  6. B. Diddy's Avatar
    It'd be interesting to see if SD Insight also read the card as invalid on other devices as well, since you mentioned that the card in question seemed to work in other phones. It's possible that if your phone's firmware is corrupt, it may mistakenly think the card is invalid.

    You're correct that a factory reset doesn't help with corrupt firmware. You could try reinstalling the firmware using either Samsung Kies ([GUIDE] Force Samsung Emergency Recovering with Samsung Kies), Samsung Smart Switch, or Odin ([Guide][Samsung] How to flash Stock ROM via ODIN with the New Interface).
    08-16-2016 02:17 AM
  7. chichuck's Avatar
    B. Diddy,
    The sd card shows up as invalid with SDInsight on my S2 just like it does on the S4.
    08-20-2016 07:51 PM
  8. B. Diddy's Avatar
    Huh, that's still strange, since you said the S2 can read and write to it without difficulty. I'd still try reinstalling the stock firmware using those methods I previously linked.
    08-21-2016 04:12 AM
  9. JadeRain's Avatar
    Iam not to good at this but theres an app u can install on ur computer that will fix the sd card, its just like if u partion ur pcs hard dirve it will partion ur sd card, the only problem i have is how to explain how u get said app. If ur interested please email me. [email address redacted by Mod]. Ill explain
    08-21-2016 04:20 AM
  10. B. Diddy's Avatar
    Please do not include your email address in posts, for your own privacy and safety. You can send Private Messages to one another within the forum, and give an email address that way.
    08-22-2016 04:43 AM
  11. JadeRain's Avatar
    Its just an email for my work, wich is fixing android and computers. But thanx for careing.
    08-25-2016 02:11 AM
  12. B. Diddy's Avatar
    OK--but we still have a policy about private info like email addresses. Please review the Community Rules & Guidelines when you get a chance: Community Rules & Guidelines - Mobile Nations Forums
    08-25-2016 10:43 AM
  13. Seymour Gurman's Avatar
    i have noticed with my note 2 and galaxy s4 that even when samsung says you can use up to 64gb sd card it doesn't always work. i bought a new samsung 32gb sd card which my computer can see but the s4 can't. so in frustration i tried a 16gb card and voila every thing is fine.
    09-01-2016 08:18 PM

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