Did you created more than 1 partitions on the card?
It is known issue that Windows in unable to mount any partition of flash drive except first one.
You can create several partitions and make there the filesystems. They can be mounted from Linux:
root@tecno:~# mount | tail -2
/dev/sdc1 on /mnt/sdc1 type vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=utf8,shortname=mixed,errors=remount-ro)
/dev/sdc2 on /mnt/sdc2 type vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=utf8,shortname=mixed,errors=remount-ro)
root@tecno:~#
But Windows can mount only first one.
Have a great day,
Victor
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