For FAT32 partitions you have to edit your /etc/fstab line to change permissions. Changing permissions on the mount point will have no effect. If you want the partition to be automounted at boot with ordinary users having read/write permissions, edit the relevant line as follows:
/dev/hdxx <mount point> vfat codepage=850,iocharset=iso8859-1,quiet,umask=0 0 0
If you don't want the partition to be automounted, but you want ordinary users to have mount and read/write permissions, edit it:
/dev/hdxx <mount point> vfat user,noauto,codepage=850,iocharset=iso8859-1,quiet,umask=0 0 0
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