Give a umask as well in that command, so something like:
mount -t vfat -o umask=000 -w /dev/sda1 /mnt/card
Might do the trick, I always do things like that in my fstab though, to reduce the amount of typing involved each time I mount something. Oh and you probably don't need both the umask and the -w option, but I am sure it won't hurt.
Cool
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