I was using my class 4 32GB SD card in my Samsung Galaxy Ace quite happily until I filled it up to a certain point (which point, exactly I'm afraid I can't find out and don't know). Once the SD card reached a certain percentage of its capacity (Somewhere in the >20GB used area) it started going into the "Sleep of death" bug, where it cannot be woken up after going into lock.

I then deleted some non-essential stuff, and the phone worked with the card quite happily for about 20 minutes, when the card died. I haven't been able to revive the card on my PC or phone.

My theory is that the processor in the Ace couldn't handle that much data on such a low-speed card, which would explain the sleep of death, but not the card failure. Is there any merit in this idea? Would a better class 32GB card have a chance of avoiding the sleep of death, or am I indulging in some wishful thinking?

Apparently the problem is very widespread in Galaxy Aces (according to the manager of a phoneshop I brought it in to), and it seems to happen the Nexus One aswell.

Any thoughts would be much appreciated.

  • 4
    I don't think a higher-class card would solve this particular problem (btw, you didn't specify which class your current card was). Not being able to revive the card the way you described looks more like a problem with that specific card as such. Was it at least recognized on the PC, and offered for formatting? Or was it totally gone?
    – Izzy
    Nov 6, 2012 at 19:30
  • 1
    I second Izzy's. I don't think this issue is caused by the slow SD card speed. You might want to check if you have an SD card with faked capacity, here's a few tips: one, two
    – Lie Ryan
    Nov 7, 2012 at 8:37

1 Answer 1


Its because of you are using Max amount SDCard that an Ace can support. Ace supports 32Gb Maximum, and you are using the same. But Its fact that Ace supports 32Gb ,but it may cause problems mounting that much higher amount.

You can try 16GB class 10, it may be accurate.

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