Files disappearing from mounted partitions

[Dotan Cohen]

My /etc/fstab:
dotancohen at ubuntu:~$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    defaults        0       0
/dev/hda1       /               ext3    defaults,errors=remount-ro 0       1
/dev/hda9       /home           ext3    defaults        0       2
/dev/hdb1       /home/dotancohen/music ext3    defaults        0       2
/dev/hda6       /home/dotancohen/video1 ext3    defaults        0       2
/dev/hda7       /home/dotancohen/video2 ext3    defaults        0       2
/dev/hda8       none            swap    sw              0       0
/dev/hdc        /media/cdrom0   udf,iso9660 user,noauto     0       0
/dev/hdd        /media/cdrom1   udf,iso9660 user,noauto     0       0
/dev/fd0        /media/floppy0  auto    rw,user,noauto  0       0
dotancohen at ubuntu:~$

All was fine until today. Now, when I open /home/dotancohen/music
/home/dotancohen/video1 or /home/dotancohen/video2 the folders seem to
be empty:
dotancohen at ubuntu:~$ ls music/
dotancohen at ubuntu:~$ ls video1
dotancohen at ubuntu:~$ ls video2
dotancohen at ubuntu:~$

Note that each of these directories have at least 5 Gigs each worth of
files. Why don't I see those files?

Thanks in advance.

Dotan Cohen
http://what-is-what.com