SD card will not format within Android therefore cannot mount. Works fine on laptop I bought a 64GB SD card for my Galaxy S3, and it worked perfectly. Today I turned on device encryption (worked fine) then I turned on SD card encryption. Since then I am stuck with the phone reporting that the SD card is blank or has an unsupported file system. Android gives me the option to format. The screen displays it is erasing, but then nothing happens.

I have tried removing the SD card and turning the phone on and off again. I have manually formatted the card using Windows 7 (ExFAT file system). I am able to read and write files to the card on the computer but the phone refuses to acknowledge a mountable SD Card.

I have also tried turning off the SD card encryption.

Any ideas on a fix?
I had the same problem...new 32gig sd card works just fine with Windows, but in my Samsung S2,S3, and EVO it says damaged, or unsupported, etc. I then read on another droid forum about this issue, and here is the easy fix:

Put your sd card into a usb reader for mem cards etc. You will notice that your card reader has a drive number like G:, or H:, etc. Make a shortcut on your windows desktop and make the shortcut location as (cmd). You may remember that cmd is the DOS-box command line prompt. Now your shortcut to cmd is on your desktop. Right click that shortcut and select "run as administrator". Now at the DOS prompt type

chkdsk &lt;drive letter of the sd&gt;: /r


Let it run through it's checks, etc. Once done just pop your sd card back into your phone and enjoy!