Since I don't see anywhere posted how to format 64gb sd cards to fat 32 here you go
http://www.ridgecrop.demon.co.uk/guiformat.exe
Just run it, select drive and format.
also Windows command format X: /FS:FAT32 does NOT work
************************
RE FORMATTING FAT 32 IN WINDOWS HOW TO..........
Open Command Prompt in Administrator mode
Click Start, type in cmd (but do not hit enter yet) look up in search results
right click on cmd.exe LEFT click on Run As Administrator, (Now your in Admin CMD Prompt)
type the following commands to format this sd card in dos
1. diskpart <enter>
2. list disk <enter>
3. find your disk in the list it will be listed as a numeric digit ie: 0, 1, 2, 3, etc etc and the size by each selection. (Be Sure You Select the correct disk, if you do not you could risk loosing data on a drive you do not want to erase)
4. assuming your sd card is the second listing select "1" no quotes so to select the disk type the following, (Everything beyond this line will be an actual command except where there are parenthesis)
5. select disk 1
6. create partition primary
7. select partition 1 (This number 1 has nothing to do with the disk number in #3 and #5)
8. active
9. format fs:fat32
10. assign
11. exit
********************** END OF COMMAND EXECUTIONS ********************
Now you have just formatted your SD card as FAT-32 mind you it will take a while to complete so be patient. I have used this procedure many many times to make other types of smart media devices it is fool proof just be careful.
hope this helps
Dev