Don't know if this was the same issue I had with a thumb drive but I finally selected MBR not GUID and formatted with exFAT.

From E.T.'s Keyboard...
   [email protected]
Many believe that we have been visited
in the past. What if it were true?

On 6/5/2016 2:55 PM, Scott Granados wrote:
Are you trying FAT or FAT32?  FAT32 is the method I believe you should
use.  I’m out of my element here so take with appropriate grains of salt.







*From: *<[email protected]> on behalf of Alex Hall
<[email protected]>
*Reply-To: *<[email protected]>
*Date: *Sunday, June 5, 2016 at 2:33 PM
*To: *'Chris Blouch' via MacVisionaries <[email protected]>
*Subject: *More Micro SD Card Problems



Hi all,

I emailed a couple days ago, asking if anyone knew why I couldn't format
a micro SD card. Well, I've now had this same problem with another card,
and with both cards in two different adapters. This is almost certainly
software, and not a problem with the cards or readers. Micro SD cards
don't have write protection switches, and the one reader I have is USB
and so also lacks a switch. I'm not sure what else to try.



I'm trying to format them as MS-Dos (FAT), and if I expand the details
of the failure, I see that it failed to modify the partition map,
whatever that means. If anyone has any ideas, I'd appreciate them. Thanks.


--

Have a great day,

Alex Hall

[email protected] <mailto:[email protected]>







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