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Samsung S7 Unsupported SD Card message...
bwze
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So around a week or so ago, I upgraded my phone via a notification that popped up in the notification area. Afterwards, I started getting this unsupported SD card message. Seems like I've seen this happen in the past with the last OS version and would simply reformat the card since it seemed to be the easiest way to get things back to normal. Now, however, the phone will not format it. It tries and then delivers the message "command '7 volume partition disk: 179,0 public' failed with '400 7 Command failed'" Every time I attempt another reformat, the first and last number (7 above) increment by one.

The first logical conclusion that I came to was that the SD card is corrupt or bad. So I took it out and with a reader, attempted to access it with my my Windows laptop. I could browse the card with no problem so I copied the data and then reformatted the card to FAT32. After reinserting into the phone, I get the same unsupported sd card message and I attempt to format. I get a progress bar that's at 20%, then the message above pops up. 

I, again, thought maybe it was the SD card so I tried another. Same thing....tried another....same thing. I've tried multiple cards no with no difference.

The first SD card is a Transcend 32GB Class 10 card and the other cards I tried are all Samsung 8GB Class 10. The phone is running Android version 7.0.

I have attempted the following with no change....factory reset, wiped the cache, booted into safe mode, and reformatting the card using both Windows DiskManagement (both quick and slow method) and GParted.

A search of this forum didn't return anything but a Google search returns quite a few hits related to this type of error message but no apparent resolution or cause.

Everything is pointing back to the phone as the culprit, but I'm just not sure if it's software in nature or hardware. My gut says it's software since it started happening after the last upgrade. Anyway, I'm hoping it's software as that would lead me to believe there is a possible fix for it.

Anyone have any ideas?

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Who I have the same questioned this topic