try this:
root
umount /home/user/MyDocs
mount /dev/mmcblk0p1 /home/user/MyDocs -o rw

or this:
root
umount /dev/mmcblk0p1
fsck.vfat /dev/mmcblk0p1
mount /dev/mmcblk0p1 /home/user/MyDocs
exit
exit