My 32GB class10 A-Data SD card went 'bad' or self corrupted on my stock SGNote2 after 50% of the card was filled. I did not have a backup or cloud setup. The card was used for about a year without incident and never removed or unmounted. The only thing that changed was upgrading to v4.3 unrooted.
This is the second time this card failed. First in my car's usb mp3 reader, and now on my note2! One card was 16gb and the other 32.
So after reading through the entire thread and considering all the differing theories, one theory has not been mentioned. COUNTERFEIT MEMORY.
I remember watching a documentary on tv about the military receiving COUNTERFEIT memory chips sourced directly from the manufacturer! This is a huge problem because consumers are clueless. By the time you purchase, use, experience a problem, enough time has passed and most people just figure that the hardware was the cause or just toss it out and buy a new card. And the cycle continues. The problem is so bad because the pakaging is perfect and you would never guess. From my own experience, most fail after half the capacity is used. Most people who buy 32Gb slowly fill them up, but if you tried to fill the card to capacity when new you would know soon enough... genuine or counterfeit. The problem of self dismounting cards might be unrelated to counterfeit cards but this problem is not going to go away.
A new protocol is needed for memory manufacturers that allows the consumer know 100% that the product they buy are real and not real crap!
After trying three different software recovery apps, i have concluded that this is a hardware recovery only option. I am now considering a recovery service that is not cheap!
https://www.youtube.com/watch?v=y-jrzsaT6ls
This is the second time this card failed. First in my car's usb mp3 reader, and now on my note2! One card was 16gb and the other 32.
So after reading through the entire thread and considering all the differing theories, one theory has not been mentioned. COUNTERFEIT MEMORY.
I remember watching a documentary on tv about the military receiving COUNTERFEIT memory chips sourced directly from the manufacturer! This is a huge problem because consumers are clueless. By the time you purchase, use, experience a problem, enough time has passed and most people just figure that the hardware was the cause or just toss it out and buy a new card. And the cycle continues. The problem is so bad because the pakaging is perfect and you would never guess. From my own experience, most fail after half the capacity is used. Most people who buy 32Gb slowly fill them up, but if you tried to fill the card to capacity when new you would know soon enough... genuine or counterfeit. The problem of self dismounting cards might be unrelated to counterfeit cards but this problem is not going to go away.
A new protocol is needed for memory manufacturers that allows the consumer know 100% that the product they buy are real and not real crap!
After trying three different software recovery apps, i have concluded that this is a hardware recovery only option. I am now considering a recovery service that is not cheap!
https://www.youtube.com/watch?v=y-jrzsaT6ls