I have Samsung GT-55570I and when try to mount internal storage his mount but under uid=root and gid=root and can't write and delete from sd card. On this case from command line use this: #mount -t vfat -o umask=0,uid=asd /dev/sdd1 /media/usb1 and have success to delete and copy to sdcard. On nautilus have same problem. Please correct this issue.