I bought a Sandisk Ultra microSDXC card with 64GB to use in my Samsung s3 mini. When I put it in the phone doesn't find it (presumably); going to `settings` -> `storage` and scrolling down to the bottom it says

    Mount SD card
    Insert SD card

but it is greyed out, so nothing happens when I tap it.

Googling around it seems I might have to format the SD card to fat32 (I tried first reformatting it with exFat, the default, and also NFTS, to no avail). But that is not an option when using `right-click` -> `format...` on windows 7. 

So I try [Fat32Formatter][1]. When I start it it claims the SD card is in NFTS format (even though it's formatted to exFat). Trying to format it to Fat32 I get the error `Failed to determine the drive`.

I also tried [HP USB disk storage format tool][2], but when I start it all the options are greyed out and I'm not even able to select a device.

Any ideas?


  [1]: http://tokiwa.qee.jp/EN/Fat32Formatter/
  [2]: http://download.cnet.com/HP-USB-Disk-Storage-Format-Tool/3000-2094_4-10974082.html