SanDisk 64GB Micro SD shows up as 27.4 GB on Windows 7

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Hello,

in that case you can also try to format the card with the hp tools software that could allow you to select to format the card on exfat. 

you can download the software from here:

http://download.cnet.com/HP-USB-Disk-Storage-Format-Tool/3000-2094_4-10974082.html