problems mounting file system at boot

[mierdatutis mi]

Hi,
Sometimes when I boot the filesystem "COMPLETADAS" doesnt mount it. In
dolphin doesn't shows me and in a terminal I get:

Code:
ls -ltr

d????????? ? ?     ?         ?                ? COMPLETADAS

david at david:~/COMPLETADAS$ ls -tlr
ls: leyendo el directorio .: Error de entrada/salida
total 0
david at david:~/COMPLETADAS$


I have in the fstab

Code:
.............
..........
/dev/sdb5      /home/david/DESCARGAS  ntfs-3g
/dev/sdc1      /home/david/COMPLETADAS ntfs-3g
/dev/sda3      /home/david/auxiliar  ext3   defaults,user,auto 0 0


With Jaunty I dont have any problem, could you help me please?
Many thanks and sorry for my english!
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