My Sony Xperia J phone was in my pocket and I wanted to read an ebook, so started my reader application. It showed a black screen and when I checked the shelf, all my books were gone.

I noticed a new notification icon that looked like a folded SD card. I checked its message that said: SD card is empty or its file system is not supported.

What? Half an hour ago I was using it. I tapped the message and a question appeared: Do you want to format your SD-card? It'll erase all data from it.

What?? All my ebooks and media are gone just like that?

I restarted the phone, still no SD-card. When I got home, I removed the card and reinserted and fortunately now it works.

How does that so-called OS dare to lose my data? And the "recovery" solution is to format the card?

What could cause this?

  • 1
    This is 99% more likely to be a hardware issue (your SD card) than a software issue (the "so-called OS"). The suggestion to format the card is not a recovery suggestion, obviously. It's saying the card needs formatting as it cannot be read (it appears unformatted, due to a fault with the SD card). Oct 31, 2013 at 13:26
  • 1
    As Archer stated: it's rather your so-called SD card which very likely will give up on you soon. I'd backup its contents ASAP and get a new one.
    – Izzy
    Oct 31, 2013 at 15:39
  • My experiences with this so-called platform are very ambiguous. My phone keeps forgetting the sound settings, can't change from Wifi to 3G sometimes. It's like a bad joke.
    – Nestor
    Nov 1, 2013 at 0:03
  • @Nestor A word of advice, if I may. Stow the negative attitude. You're on a Q&A site for Android enthusiasts. You may receive a more sympathetic response if you don't slate the thing that they love that has brought them here. It's not constructive and you can post without it. Not getting into a debate about it - just saying. I hope you get your problem resolved :) Nov 1, 2013 at 12:49

1 Answer 1


One of my family members had the same problem, SD card misbehaving, then working for a few days, on and off. After a week or so the phone did not read the card at all and neither did the PC. Fortunately I backed up the content of the card after the first problem. The card worked for about a month after formatting, but died eventually.

I do not know what causes this.
I do not know how to stop it.
I know what you should do: a backup.


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