[SOLVED] Cdrom mount trouble

When i try to mount a cdrom in my cdrom drive nothing happens.What can i do,pls?This is my /etc/fstab

Code:

# /etc/fstab: static file system information.
#
# The following is an example. Please see fstab(5) for further details.
# Please refer to mount(1) for a complete description of mount options.
#
# Format:
# <file system> <mount point> <type> <options> <dump> <pass>
#
# dump(8) uses the <dump> field to determine which file systems need
# to be dumped. fsck(8) uses the <pass> column to determine which file
# systems need to be checked--the root file system should have a 1 in
# this field, other file systems a 2, and any file systems that should
# not be checked (such as MS-initrd/mnt or NFS file systems) a 0.

# The Linux partitions
/dev/hda1 / reiserfs noatime 0 1

# Shared Windows/Linux partition
#/dev/hda1 /mnt/dos msdos umask=0 0 0
#/dev/hda1 /mnt/win vfat fmask=111,dmask=0,quiet,shortname=mixed,user 0 0
#/dev/hda1 /mnt/win ntfs umask=0 0 0

# Floppy disks
# The 'noauto' option indicates that the file system should not be mounted
# with 'mount -a' 'user' indicates that normal users are allowed to mount
# the file system.
/dev/fd0 /mnt/floppy auto defaults,noauto,user 0 0
#/dev/fd1 /mnt/floppy auto defaults,noauto,user 0 0

# If you have a ls-120 floppy drive, it could be on /dev/hda b c d etc.
#/dev/hdd /mnt/ls120 auto defaults,noauto,user 0 0

# CDROM, CDWRITER, DVD
/dev/cdrom /mnt/cdrom iso9660 users,noauto,ro
/dev/cdwriter /mnt/cdwriter iso9660 users,noauto,ro
/dev/dvd /mnt/dvd iso9660 users,noauto,ro

# NFS file systems:
#linux01.gwdg.de:/suse/6.3/i386.de /mnt/nfs nfs defaults 0 0

# proc file system:
proc /proc proc defaults 0 0

# Unix98 devpts filesystem:
none /dev/pts devpts gid=5,mode=666 0 0

# Shared memory filesystem:
tmpfs /dev/shm tmpfs defaults 0 0

# Basic USB filesystem
sysfs /sys sysfs defaults 0 0

# example of a VFAT USB pendrive
#/dev/sda1 /mnt/pendrive vfat fmask=111,dmask=0,noauto,user,quiet,shortname=mixed 0 0

# Swap partitions
# The 'sw' option means auto activating with 'swapon -a'.
/dev/hda5 none swap sw 0 0

This is the output of mount /dev/cdrom /mnt/cdrom

Code:

mount /dev/cdrom /mnt/cdrom
mount: block device /dev/cdrom is write-protected, mounting read-only
mount: /dev/cdrom already mounted or /mnt/cdrom busy
mount: according to mtab, /dev/hdc is already mounted on /mnt/cdrom

Thank you in advance.