[RESEARCH] SDCARD unmounted unexpectedly issue, probable cause, possible fix.

[Crescendo Xenomorph]

OK, seems I understand the issue, and seems also that I cornered the issue.

First, the card is working normally while DEVICE ISN'T SLEEPING.
Second, it happens mostly while WE'RE SLEEPING AT NIGHT or WHILE THE PHONE LEFT DEEP SLEEP (Paranormal Activity? LOL)

So, based on this: something in kernel/ROM/anything that control the power to SDCARD doesn't provide correct/adequate voltage or electricity to the SDCARD while the phone in DEEPSLEEP.

Or: the card don't want to be suspended in deepsleep, it just removing itself when instructed to sleep (this one is the card's fault).

And: any card thats been badly removed thousands times (it can do around 20 bad removal at 7h period so, count it yourself), its become broken/unusable but not fried as stated in many site). The chip broken,yes,but due to bad removal thousands times....

So, any response and research is needed on this.

Also disassembling the device to re-plug the sd/sim module flex inside doesn't help at all, so don't bother with it.

 

[maxrdlf95]

I'm really into this really, because my SIII has already killed two 32 GB Class 10 Cards... suddenly the last one was a week ago I copied a filed restarted phone to recovery and boom SD gone... so I will check this post I think that the SD card killing case was only a few people but it seems like a major problem.

 

[AndreiLux]

This is caused by bad quality SD cards. SanDisk already admitted it as a failure on their side.

I've already spent countless methods in trying to debug and fix it. I solved it by buying a new card.

 

[Crescendo Xenomorph]

Hmm, so the moderators can delete this thread as it seems that this doesnt need any research...

Coz many also said that using Samsung's card also got this trouble...

 

[nation888]

[solved] sd card umounting galaxy note 4 autosync dropbox

There are security files on the SD card that are markers that can't be over written. Simply copy all your data to a pc. Then format using the note sd format. Then copy only the important files like pictures movie ect. It's a security feature just start over.